RU1805336C - Method of measuring dust content of gas flow - Google Patents

Abstract

Usage: in the field of mechanical engineering, namely, methods for measuring the dust content of a gas stream, and can be used in the building materials industry, mining, metallurgy, coal industry and other industries, where it is necessary to measure the dust content of gas flows. Essence: to implement the proposed method in a pipeline for transporting a dust and gas stream with a thrust inducer (for example, a blower) and a chute for supplying bulk material with a damper, a speed meter is installed in the cavity of the pipeline for transporting dust and gas flow — a speed meter is in front of the chute for supplying bulk material along the direction of the dust and gas stream connected to instrumentation. The change in flow rate corresponds to a change in the dust content of the stream. 3 ill. 4 Ј

Description

The invention relates to methods for measuring the dust content of a gas stream and can be used in the construction materials industry, mining, metallurgy, coal industry and other industries.

The purpose of the invention is to simplify the method for measuring the dust content of a gas stream.

Figure 1 shows the device, a General view: figure 2 is a speed meter; in Fig.Z - section A - A in Fig.2.

The device comprises a horizontal pipeline 1 for transporting a dust and gas stream with a thrust inducer 2 (for example, a blower) and a chute 3 for supplying bulk material with a damper 4, a speed meter 5 installed in the cavity of the pipeline for transporting dust and gas flow in front of the chute for supplying bulk material in the direction of the dust and gas stream, comprising a housing 6 connected to a speed meter, consisting of a vortex-forming element 7. made in the form of a hollow cylinder with variable walls in cross section and the thickness of the inner cavity of which on the thin wall 8 9 strengthened piezoelectric (piezo) that the conductor 10 connected to test equipment 11, wherein the vortex generating wall member 12 is thick, kon00

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trolno-measuring equipment has a pointer arrow 13 and the installation knob 14: zero. The method is carried out as follows.

Close the shutter 4 for supplying material to the piping 1 for the transportation of the gas and gas. flow, turn on the apparatus 2 for changing the pressure in the pipeline 1 (for example, a blower) and pump through the pipeline -1 pure gas, for example, air, v

Manual setting to zero arrow 13 is set. affect 6. When bulk material (for example, silica sand) is fed into the pipeline through the chute 3 by opening the shutter 4, the dust content of the flow in the pipeline increases, which will lead to a change in the network resistance and, accordingly, the gas flow velocity in the area from the blower apparatus 2 machines before the gutter 3 adjoins the pipeline 1..

Example. When the gas flow ran onto the vortex-forming element 7 with a diameter of 4 mm, in the wake of it the number of pressure fluctuations in 1 s was 1000 1 / s; 920 1 / s; 810 1 / s; 715 1 / s; 605 1 / s; 548 1 / s These fluctuations corresponded to the gas flow rates (in the area from the blower - apparatus 2 to the junction of the trench 3 to the pipeline 1) at 20, at 19.2, at 18.3 at 17.7, at 16.6 and at 16 m / with respectively.

According to the preliminary calibration of the speed of 20 m / s,

centralization of the dust-gas flow 0 kg / m; velocity 19.2 m / s -100 kg / m3; speeds of 18.3 m / s - 200 kg / m3; speeds of 17.7 m / s - 300 kg / m3, etc. . To account for the influence of various factors:

the speed of the non-dusty gas flow, periodically check the zero setting on the reference scale of the instrumentation 11.

The method is designed for any measurement of dust concentrations.

Claims (1)

The claims A method of measuring the dust content of a gas stream, including organizing the movement of a clean gas stream, mixing a clean gas stream and a stream with dust particles, determining a parameter characterizing the state of the gas stream, and the calculation of dust, characterized in that, in order to simplify the method, the movement of the clean gas stream is organized in the pipeline, and as a parameter, characterizing the state of the gas stream, use the speed of the clean gas stream, which is measured in the section of the pipeline to the place of mixing of the clean gas stream and the stream with dust particles, and the dust content is calculated by changing the gas velocity during mixing of the flows relative to the gas velocity in the absence of mixing.  Ј - 4J