RU207836U1 - AUTOMATED DEVICE FOR SAMPLING DUST FROM THE DUSTED GAS STREAM TRACT - Google Patents

Abstract

The utility model relates to devices for sampling dust from a dusty gas flow path and can be used, in particular, when sampling dust from dust pipelines designed to supply a dust-coal-air mixture under pressure to combustion chambers of boiler units of thermal power plants (TPP). A device for sampling dust from a duct of a pressurized dusty gas stream contains a hollow screw connected to a drive, which is configured to provide a translational-rotational movement of the hollow screw. In this case, a dust collection tube is installed inside the hollow screw, and the drive is fixedly connected to the lug. Moreover, a sealing plug is attached to the outer end wall of the boss, and the hollow screw passes through a through hole in the sealing plug and through a through hole in the end wall of the boss. The inlet end of the dust collection tube, intended for entry into the dust pipe, is rotated at an angle of 90 °. The outlet end of the dust collection tube is connected by a flexible hose with a cyclone, which is connected to an ejector and a container for collecting dust. A branch pipe is connected to the side wall of the lug for air supply. The drive is made remotely controlled. EFFECT: provision of automatic dust sampling from the TPP dust pipeline. 3 C.p. f-ly, 10 ill.

Description

Scope of use

The utility model relates to devices for sampling dust from a dusty gas flow path and can be used, in particular, when sampling dust from dust pipelines designed to supply a dust-coal-air mixture under pressure to combustion chambers of boiler units of thermal power plants (TPPs).

State of the art

Coal in the form of dust is used as fuel in boilers of pulverized-coal TPPs. To obtain the specified dust, coal is ground in special mills. Coal dust mixed with transporting air is fed through the dust pipelines to the combustion chambers, in which it is burned.

To determine the fractional composition of coal in order to control the quality of its grinding and the amount of coal dust obtained, dust samples are taken from the dust pipelines. Currently, TPPs often use pressure pulverizing systems. In the case of sampling dust from dust preparation systems operating under pressure, it is necessary to ensure that coal dust does not enter the working area.

Known adopted as a prototype of the claimed utility model is a device for sampling dust from a duct of a pressurized dusty gas stream, containing a sampling module temporarily introduced into the required location of the specified duct in the form of a cylindrical hollow insert. In this case, the specified device is additionally equipped with a receiving branch pipe installed in the specified required place in the corresponding wall of the specified path for insertion of the specified hollow insert. Inside the specified branch pipe, coaxially with it, a guide sleeve tapering inward from its end is installed to enter the intake module. Moreover, the inlet end of the specified sleeve is equipped with a removable cover that tightly closes it in the absence of an intake module, and on the side surface of the specified intake pipe there is a fitting for supplying compressed air, which prevents dust emission into the working room at the time of entering the intake module into the intake pipe (patent for invention RU 2668370 C1, G01N 1/22, published: September 28, 2018, hereinafter - [1]).

The disadvantages of a device known from [1] for sampling dust from a duct of a pressurized dusty gas stream are as follows.

Moving the intake module, which is a cylindrical hollow insert, over the section of the dust pipe and control of the dust sampling parameters are carried out in manual mode, which leads to a deterioration in the quality of the resulting dust sample, since it is impossible to fully provide isokinetic conditions for its sampling in manual mode.

The device known from [1] is portable, which impairs the reliability, convenience and efficiency of its use. Each time dust is collected, it is necessary to mount / dismantle the device.

Dust sampling in manual mode is carried out by a team of at least three people. At the same time, the working conditions of people are unsatisfactory, since during the unscrewing / twisting of the removable cover at the end of the guide sleeve, as well as when the intake module is manually inserted into the guide sleeve for the purpose of sampling, part of the coal dust from the dust pipe under pressure enters the working room. In the case of using explosive coal, this circumstance may cause an explosion or cotton dust.

Disclosure of a utility model

The objective of the claimed utility model is to increase the efficiency, reliability and safety of coal dust extraction at TPPs from a pressurized dust pipeline, and the technical result is to ensure automatic dust sampling from the TPP dust pipeline.

The solution of this problem by achieving the specified technical result in relation to the claimed utility model is ensured by the fact that the device for sampling dust from the duct of a pressurized dusty gas stream contains a hollow screw connected to a drive, which is configured to provide translational-rotational motion of the hollow screw ... At the same time, a dust collection tube is installed inside the hollow screw, and the drive is fixedly connected to the lug. Moreover, a sealing plug is attached to the outer end wall of the boss, and the hollow screw passes through a through hole in the sealing plug and through a through hole in the end wall of the boss. In this case, the inlet end of the dust collection tube, intended for introduction into the dust pipe, is rotated at an angle of 90 °, and the outlet end of the dust collection tube is connected using a flexible hose with a cyclone, which is connected to an ejector and a container for collecting dust. Moreover, a branch pipe is connected to the side wall of the lug, intended for supplying air, and the drive is made remotely controlled.

The causal relationship between the set of essential features of the claimed utility model and the achieved technical result is as follows.

The boss is installed in the inlet pipe connected to the outer side wall of the dust pipe. In the initial position, the inlet end of the dust collection tube, turned at an angle of 90 °, is located inside the inlet pipe. Moreover, the inlet end of the dust collection tube is turned away from the flow of the dust-air mixture in the dust pipe so that the dust-air mixture does not get into it. If there is no need for dust extraction, the boss and the inlet pipe are periodically purged with compressed air through the air supply pipe connected to the side wall of the boss. When taking a sample of dust, the hollow auger, inside which a dust collection tube is installed, is set in translational-rotational motion by the operator using a control panel connected to a remotely controlled drive. The drive is programmed so that the inlet end of the dust collection tube, turned at an angle of 90 °, can stop at several positions inside the dust pipe, at which its inlet is turned towards the flow of the dust-air mixture in the dust pipe, so that the dust-air mixture enters the inlet end of the dust collection tube. With the translational rotational movement of the hollow screw, the flexible hose is twisted, due to which the cyclone with the ejector and the container for collecting dust connected to it remains stationary. At the same time, the supply of compressed air to the inlet pipe of the ejector begins, due to which a vacuum arises in the dust collection tube connected to the cyclone with the help of a flexible hose and, thus, the dust-air mixture from the dust pipeline begins to be drawn into it. First, the dust-air mixture passes through a dust extraction tube and a flexible hose, and then it is separated into air and dust in a cyclone. In this case, the dust-free air enters through the cyclone tube for air removal into the ejector nozzle and then leaves the ejector diffuser, and the dust is directed through the cyclone cone to the dust collection container. Sampling of dust is carried out at several points of the section of the dust pipe. After the completion of dust sampling, the hollow auger is set in translational-rotational motion by the operator using the control panel to remove the inlet end of the dust collection tube, rotated at an angle of 90 °, from the dust pipe to the position at which the inlet end of the dust collection tube is turned away from the flow of the dust-air mixture in the dust pipeline ...

Thus, the need for manual insertion of the dust tube into the TPP dust pipe from which dust samples are taken is eliminated, and automatic dust sampling from the dust pipe is provided.

Brief Description of Drawings

FIG. 1 is a top view of a device for sampling dust from a pressurized dusty gas stream connected to a dust pipeline. Figure 2 shows a view of a device for sampling dust from a duct of a pressurized dusty gas stream connected to a dust pipeline in section A-A. FIG. 3 is a side view of a device for sampling dust from a pressurized dusty gas stream connected to a dust pipe. FIG. 4 shows a view of a device for sampling dust from a duct of a pressurized dusty gas flow connected to a dust pipeline, in section BB. Figure 5 shows a diagram of the movement of the dust collection tube over the cross section of the dust pipe. FIG. 6 is a top view of the cyclone. FIG. 7 shows a view of a cyclone in section B-B. FIG. 8 is a side view of the cyclone. FIG. 9 shows a view of a cyclone in section Г-Г. FIG. 10 shows the ejector in a longitudinal section along the axis of symmetry.

List of drawing positions

1 - hollow screw;

2 - drive;

3 - dust collection tube;

4 - boss;

5 - sealing plug;

6 - inlet pipe;

7 - dust pipe;

8 - flexible hose;

9 - cylinders;

10 - cyclone;

11 - container for collecting dust;

12 - branch pipe for air supply;

13 - disk;

14 - ejector;

15 - ejector branch pipe;

16 - ejector body;

17 - nut;

18 - diffuser;

19 - inlet pipe;

20 - retainer;

21 - nozzle;

22 - confuser;

23 - mixing tube;

24 - end cover;

25 - inlet tube;

26 - cone;

27 - a tube for air removal.

Implementation of the utility model

Below is a particular example of the design and implementation of the device for sampling dust from the path of a pressurized dusty gas stream.

The device for sampling dust from the duct of a pressurized dusty gas stream contains a hollow screw 1 made of Steel 20, connected to a remotely controlled drive 2, which is configured to provide a translational-rotational movement of the hollow screw 1. As a remotely controlled drive 2, it can be used electric actuator SA / SAR from AUMA. In this case, a dust collection tube 3 made of Steel 20 is threaded into a through hole in a disc 13 made of Steel 20 and welded to it, and the disc 13 is attached to the end surface of the hollow screw 1 using bolts (not shown in the figure). The drive 2 is welded to two steel 20 cylinders 9, which are welded to the boss 4 made of 20 Steel. To the outer end wall of the boss 4, a sealing plug 5 made of Steel 20 is bolted (not shown). the screw 1 passes through a through hole in the sealing plug 5 and through a through hole in the end wall of the boss 4 with a small gap (Figs. 1, 2, 3, 4). The cyclone 10 made of Steel 20 contains a cylindrical inlet tube 25, a cone 26 and a cylindrical tube for venting air 27 (Figs. 6, 7, 8, 9). In this case, the inlet end of the dust collection tube 3, intended for entry into the dust pipe 7, is rotated at an angle of 90 °, and the outlet end of the dust collection tube 3 is connected by means of a flexible hose 8 made of rubber and clamps (not shown in the figure) with the inlet tube 25. The cone 26 is connected by means of a flange connection (not shown in the figure) with a container made of Steel 20 for collecting dust 11. The ejector 14 contains a cylindrical pipe 15 made of Steel 20, which is connected by means of a flange connection (not shown) with a pipe for venting air 27. In this case, the ejector nozzle 15 is welded to the outer surface of the side wall of the cylindrical body of the ejector 16 made of Steel 20, which contains an end cap 24 made of Steel 20. The inlet 19 made of Steel 20 passes through a through hole in the end cap 24 and welded to it. In this case, a plate-shaped retainer 20 made of Steel 20 is welded to the inner surface of the side wall of the ejector body 16. The inlet 19 passes through a through hole in the retainer 20 and is welded to it. A nozzle 21 made of Steel 20 is welded to the end of the inlet pipe 19 located inside the ejector body 16. At the same time, a nut 17 made of Steel 20 is screwed to the outlet end of the ejector body 16, to the inner surface of which a confuser 22 made of Steel 20 is welded. confuser 22 is welded made of Steel 20 and passing through a through hole in the nut 17 mixing tube 23, to the outlet end of which is welded made of Steel 20 diffuser 18 (Fig. 10). To the side wall of the boss 4 is welded made of Steel 20 pipe for supplying air 12 (Fig. 1, 2, 3, 4).

The operation of the device for sampling dust from the path of a pressurized dusty gas stream is carried out as follows.

The lug 4 is installed in a cylindrical inlet pipe 6 made of Steel 20, welded to the outer side wall of a cylindrical dust duct made of Steel 20 7. In the initial position, the inlet end of the dust collection tube 3, turned at an angle of 90 °, is located inside the inlet pipe 6. Moreover, the inlet end The dust-collecting tube 3 is turned away from the flow of the dust-air mixture in the dust pipe 7 so that the dust-air mixture does not get into it. If there is no need for dust sampling, the boss 4 and the inlet 6 are periodically purged with compressed air through the air inlet 12 connected to the side wall of the boss 4. When taking a dust sample, the hollow auger 1, inside which the dust sampling tube 3 is installed, is brought forward -the rotational movement by the operator using a control panel (not shown in the figure) connected to a remotely controlled drive 2. Drive 2 is programmed so that the inlet end of the dust collection tube 3, rotated at an angle of 90 °, could stop in five positions inside the dust pipe 7 , in which its inlet is turned towards the flow of the dust-air mixture in the dust pipe 7, so that the dust-air mixture enters the inlet end of the dust-collecting tube 3 (Fig. 5). With the translational rotational movement of the hollow screw 1, the flexible hose 8 is twisted, due to which the cyclone 10 with the ejector 14 and the dust collection container 11 attached to it remain stationary. In this case, the supply of compressed air begins to the inlet pipe of the ejector 15, due to which a vacuum arises in the dust collection pipe 3 connected to the cyclone 10 by means of a flexible hose 8 and, thus, the dust-air mixture from the dust pipe 7 begins to be drawn into it. First, the dust-air mixture passes through dust collection tube 3 and flexible hose 8, and then in the cyclone 10 it is separated into air and dust. In this case, the dust-free air enters through the air outlet pipe 27 into the ejector nozzle 15 and then leaves the ejector diffuser 18, and the dust is directed through the cone 26 into the dust collection container 11. The dust sample is taken at five points in the section of the dust pipe 7. After the end of the dust sampling, the hollow auger 1 is set in translational-rotational motion by the operator using the control panel to output the inlet end of the dust sampling tube 3, turned at an angle of 90 °, from the dust pipe 7 to the position at which the inlet end of the dust sampling tube 3 is turned away from the flow of the dust-air mixtures in the dust pipe 7.

When using the inventive device for sampling dust from the duct of a pressurized dusty gas stream, the need for manual insertion of the dust collection tube 3 into the dust pipe 7, from which dust samples are taken, is eliminated, and automatic dust sampling from the dust pipe 7 is provided, which makes it possible to increase efficiency, reliability and safety of selection of coal dust at TPPs from the dust pipeline 7 under pressure. In addition, a higher quality of the selected dust sample is ensured, since the movement of the dust collection tube 3 is carried out according to the algorithm incorporated in the software of the drive 2 and, thus, the influence of the human factor on the quality of the resulting dust sample is leveled.

Industrial applicability

The claimed device for sampling dust from a duct of a pressurized dusty gas stream meets the condition of "industrial applicability". The essence of the technical solution is disclosed in the formula, description and drawings clearly enough for understanding and industrial implementation by the relevant specialists, and the means used are simple and available for industrial implementation in the field of devices for sampling dust from the dusty gas flow path.

Claims (4)

1. A device for sampling dust from a duct of a pressurized dusty gas stream, characterized in that it contains a hollow screw connected to a drive, which is configured to provide a translational-rotational movement of the hollow screw; at the same time, a dust-collecting tube is installed inside the hollow screw, and the drive is fixedly connected to the lug; moreover, a sealing plug is connected to the outer end wall of the boss, and the hollow screw passes through a through hole in the sealing plug and through a through hole in the end wall of the boss; wherein the outlet end of the dust collection tube is connected by means of a flexible hose to a cyclone, which is connected to an ejector and a container for collecting dust. 2. The device according to claim. 1, characterized in that the inlet end of the dust collection tube, intended for introduction into the dust pipe, is rotated at an angle of 90 °. 3. The device according to claim. 1, characterized in that a branch pipe is connected to the side wall of the boss for supplying air. 4. The device according to claim 1, characterized in that the drive is made remotely controlled.

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