Wide-range high-temperature-resistant steam two-phase flowmeter

Abstract

The invention relates to a wide-range high-temperature-resistant steam two-phase flowmeter. The wide-range high-temperature-resistant steam two-phase flowmeter comprises a vortex shedding flowmeter and a temperature sensor; the vortex shedding flowmeter comprises a measuring pipeline A and a meter head; a computing control part is arranged in the meter head; a cylinder A and a measuring probe A are arranged in the measuring pipeline A; a measuring pipeline B is arranged in the measuring pipeline A; a cylinder B and a measuring probe B are arranged in the measuring pipeline B; the temperature sensor is used for measuring the environment temperature; the meter head is connected with the measuring pipeline A through a connecting pipe made of heat insulation materials; heat conduction liquid is arranged in the connecting pipe; a pipeline is arranged on one side of the connecting pipe; one side of the pipeline is connected with the interior of the connecting pipe; a piston is arranged in the pipeline; one side of the piston is connected with an electric telescopic rod; and the electric telescopic rod is connected with the operation control component. According to the steam two-phase flowmeter, the measuring range can be automatically changed according to different flows, the cost is greatly saved, the working efficiency is greatly improved, meanwhile, the meter head can be always located at the proper working temperature, and the good measuring stability is achieved.

Description

technical field [0001] The invention belongs to the technical field of flowmeters, in particular to a large-range high-temperature resistant steam two-phase flowmeter. Background technique [0002] The vortex flowmeter is one of the commonly used flowmeters for measuring steam flow. Its basic principle is the Karman vortex principle, that is, the vortex separation frequency is proportional to the flow velocity. The specific application is: insert an approximately isosceles triangle cylinder into the measuring pipe, the axis of the cylinder is perpendicular to the flow direction of the measured medium, and the bottom faces the fluid. When the measured medium flows through the cylinder, the The vortices are alternately generated on both sides, and the vortices are continuously generated and separated. Two columns of vortices are staggered in the downstream of the column. The frequency of vortex separation is proportional to the flow velocity of the column side medium. [0003...

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Problems solved by technology

[0003] In the actual measurement of high-temperature steam, the following problems will be encountered: (1) In the later stage of production, the flow rate of the measured fluid will become smaller. At this time, the measured fluid cannot stably form two rows of vortices downstream of the column, resulting in inaccurate measurement , it is necessary to replace the flowmeter with a smaller aperture to make the measured fluid re-form a vortex, which will result in higher operating costs and delays in production; (2) The meter head of the flowmeter is connected to the measuring pipe through a metal connecting pipe, and the steam The temperature is high, which leads to the high temperature of the measuring pipe. The heat on the measuring pipe will be transferred to the meter head through the connecting pipe. There are many precision parts in the meter head. In the hot summer, it is easy to affect the service life and measurement stability of the meter head.

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