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Wet steam flow instrument and measuring method

A technology of wet steam and flowmeter, which is applied in the direction of mass flow measurement device, indirect mass flowmeter, material moisture content, etc., which can solve the problems of poor measurement accuracy and achieve the effect of high precision of wet steam

Inactive Publication Date: 2010-09-22
南通东华炉业有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the shortcomings of poor measurement accuracy in the prior art, the present invention proposes a wet steam flowmeter and measurement method

Method used

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  • Wet steam flow instrument and measuring method
  • Wet steam flow instrument and measuring method

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Embodiment 1

[0022] This embodiment is a wet steam flowmeter, which is used to measure the wet steam flow and dryness in a wet steam pipeline with a wet steam pressure of 15MPa, a wet steam flow of 5-9t / h, and a steam dryness of 60-85%. , where the inner diameter of the wet steam pipeline is 56mm and the wall thickness is 10mm; the flowmeter is an orifice flowmeter, and the flowmeter is a constant velocity tube flowmeter.

[0023] This embodiment includes a wet steam pipeline 1 , an orifice flowmeter 2 , a pressure gauge 3 , a dryness flow processor 4 and an equalizing tube flowmeter 5 . The flow dryness processor has a built-in steam thermal physical property database and a mathematical model of steam flow dryness. The wet steam pipe 1 is a seamless steel pipe made of No. 20 boiler steel with an inner diameter of 56mm, a wall thickness of 10mm, and a length of 1000mm. The orifice flowmeter 2 and the equal velocity tube flowmeter 5 are connected in series on the wet steam pipeline 1, resp...

Embodiment 2

[0037] This embodiment is a wet steam flow meter, which is used to measure the wet steam flow rate and the wet steam flow rate in a wet steam pipeline with a wet steam pressure of 8-18MPa, a wet steam flow rate of 4-10t / h, and a steam dryness of 40-90%. Dryness, wherein, the inner diameter of the wet steam pipeline is 56mm, and the wall thickness is 10mm; the flowmeter is an inner cone flowmeter, and the flowmeter is a thermal flowmeter.

[0038] This embodiment includes a wet steam pipeline 1 , an inner cone flowmeter 2 , a pressure gauge 3 , a dryness flow processor 4 and a thermal flowmeter 5 . The flow dryness processor has a built-in steam thermal physical property database and a mathematical model of steam flow dryness. The wet steam pipe 1 is a seamless steel pipe made of No. 20 boiler steel with an inner diameter of 56mm, a wall thickness of 10mm, and a length of 1000mm. The orifice flowmeter 2 and the equal velocity tube flowmeter 5 are connected in series on the wet...

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Abstract

The invention discloses a wet steam flow instrument and a measuring method. An orifice plate flow meter and a uniform speed tube kinemometer are connected in series on a wet steam pipeline; a pressure gauge is arranged in the wet steam pipeline between the flow meter and the kinemometer, a dryness flow processor is placed in an instrument box, and a support rod of the instrument box is welded on the outer wall of the wet steam pipeline; and a steam thermal physical property database and a steam flow dryness mathematical model are placed in the flow dryness processor. The measuring method comprises the following steps of: acquiring a fluid dynamic-static pressure difference signal delta Pk on a differential pressure transmitter of the flow meter, a fluid pressure signal P of the pressure gauge and a dry saturated steam flow rate Ug of the kinemometer through the dryness flow processor; obtaining a saturated water density rho1 and dry saturated steam density rhog through the flow dryness processor; and performing combined solution on the steam flow dryness mathematical model consisting of a void fraction alpha equation, a steam dryness x equation, a steam density rho equation and a flow meter flow G equation to obtain steam quality flow and steam dryness to be solved in the wet steam pipeline. The measuring method has the advantage of high wet steam measuring precision.

Description

technical field [0001] The invention relates to the technical field of physical property measurement of wet steam two-phase flow, and relates to a wet steam flowmeter and a measuring method. Background technique [0002] Wet steam is a mixture of gas and liquid, and it is a gas-liquid two-phase flow. Steam dryness is an important quality parameter of steam. The ratio of the gas-phase dry saturated steam quality to the wet steam quality of wet steam is called steam dryness. Wet steam is widely used in industrial processes such as oil extraction, chemical industry, food processing, and pharmaceuticals. In order to implement effective technical monitoring of the steam utilization process, it is necessary to measure the steam dryness and flow rate. [0003] The application document with the publication number CN101038188 discloses a combined wet steam flow, dryness measurement device and its measurement method. The core technology of the invention is: install two flow meters in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/88G01N25/60
Inventor 李世武张久云刘晓锋
Owner 南通东华炉业有限公司
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