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Microwave measuring device for detecting the charge of a two-phase flow

A microwave measurement and fluid technology, which is used in measurement devices, liquid/fluid solid measurement, and material analysis using microwave methods, can solve problems such as complex installation, insufficient measurement accuracy, and air flow conditions, and achieve economical structure and measurement results. Accurate, Simple Cost Results

Inactive Publication Date: 2005-05-18
PROMECON PROZESS & MESSTECHN CONRADS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In any case, for the preferred application of determining the loading of gas flows of solid particles in large-capacity pneumatic solids transport systems of the type employed, for example, in pulverized coal combustion systems of coal-fired power stations, the measurements that can be obtained precision is insufficient
Furthermore, the installation necessary to install the tube sections into the transfer line is complex and has a significant impact on the gas flow conditions within the transfer line

Method used

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  • Microwave measuring device for detecting the charge of a two-phase flow
  • Microwave measuring device for detecting the charge of a two-phase flow

Examples

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Embodiment Construction

[0021]The figure depicts a section of a feed line 1 for pneumatically conveying pulverized coal in a partially cutaway manner. The feed pipe 1 is of the type usually used in pulverized coal fired furnaces in power stations. The feed pipe 1 is made of corrosion-resistant steel. It has an approximately circular cross-section with a diameter D=200mm. The transmitting antenna 2 and the receiving antenna 3 extend from the outside into the feeding pipe, are installed continuously at intervals of 300 mm in the longitudinal direction of the feeding pipe, and form a measuring path S. Microwaves with a frequency between 840 and 860 MHz are coupled through the transmission antenna 2 . These microwaves correspond to the waveguide fundamentals of the feed pipe 1 . Along the longitudinal direction of the feeding pipe 1, in front of the transmission antenna 2 and behind the receiving antenna 3, in the polarization plane of the input microwave, there are field rods 4 and 5 extending radial...

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Abstract

The invention relates to a microwave measuring device for detecting the charge of a two-phase flow with a gaseous carrier medium containing small and minuscule solid and / or fluid particles and for detecting gas contained in a fluid flow, preferably by means of waveguide carrier waves. A preferred application of the invention is the detection of solid particles contained in the flow of gas of voluminous pneumatic solid matter transport systems used, for example, for pulverized coal furnaces of coal power stations. The inventive microwave measuring device is provided with field rods, which protrude into the inside of the feed pipe, are arranged before and after a measuring section formed by a transmission antenna and a reception antenna, said rods interacting with the feed pipe made of conductive material as a resonator for microwaves injected into the feed pipe via the transmission antenna, whereby microwaves that differ from the injected microwaves in their plane of polarization and / or phase as a result of diffraction, superposition, and / or reflection outside the measuring section are essentially short-circuited in order to prevent the results of the measurement from being distorted. The inventive device has the particular advantage of being simple to build and easy to install even in voluminous and branched feed pipe systems.

Description

technical field [0001] The invention relates to a microwave measuring device for determining the load of a two-phase fluid comprising a gaseous carrier medium with fine and minute solid and / or liquid particles, and for determining the gas contained in the fluid flow. A preferred field of application of the invention relates to the determination of the load of gas streams laden with solid particles in such large-capacity pneumatic solids transport systems, for example in pulverized coal furnaces of coal-fired power stations. Background technique [0002] Methods for determining the loading of two-phase fluids comprising a gaseous carrier medium by means of microwaves, as well as the proportion of gas contained in the fluid flow, are known. In many such known systems, microwaves of certain frequencies are coupled into a portion of a feed duct intended to be used as a measurement duct, and any changes in microwave amplitude and phase are recorded at the end of the duct. The pr...

Claims

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Application Information

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IPC IPC(8): G01F1/66G01F1/74G01N15/06G01N22/00
CPCG01F1/662G01F1/74G01N15/0656G01N22/00
Inventor 汉斯·G·康拉德斯沃尔克哈德·克卢普希亚历山大·哈尔姆
Owner PROMECON PROZESS & MESSTECHN CONRADS
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