RU107843U1 - COAL DUST FEEDING SYSTEM - Google Patents

Abstract

 1. A system for supplying coal dust for combustion, including feed lines for coal fuel and a drying agent, connected to a grinding device, a device for separating the air mixture, the outlet pipes of which are connected by distributing dust pipes to the burners of the furnace of the boiler, characterized in that the device for separating the air mixture the possibility of two-stage separation of the latter in each stage into two streams, separated from each other by a distance and located in mutually perpendicular planes, s pyleprovody aeromixture provided with resistance regulation devices, and the supply line of the drying agent flow dividers mounted. ! 2. The system according to claim 1, characterized in that the device for separating the air mixture is equipped with slide gates made with adjustable rotation. ! 3. The system according to claim 1, characterized in that the device for regulating the resistance of the air mixture is made in the form of a damper connected to a screw pair with the possibility of a controlled change in the cross section of the dust pipe. ! 4. The system according to claim 1, characterized in that the flow dividers of the supply line of the drying agent are made in the form of dividing plates.

Description

The utility model relates to a power system, namely, devices for preparing solid fuel for burning, and can be used in thermal power plants, boiler houses, etc., as well as in industries where aerated materials are required.

Known dust distributor (Aut. USSR certificate No. 493599, IPC F23K 3/02, publ. 11/30/1975), containing a vertical cylindrical body, divided by radial partitions into channels and nozzles for the exit of air mixtures. The known technical solution does not have a sufficiently high uniformity of dust distribution along the dust pipes, significant metal consumption and aerodynamic drag. Under these conditions, the known solution does not provide a stable, uniform and reliable supply of pulverulent material.

A known system for the preparation of pulverized fuel, containing the feed line of the original coal fuel and a drying agent connected to the grinding device, a device for separating ready-mixed dust mixtures, the outlet pipes of which are connected by dust pipes to the burners of the boiler furnace (USSR Author's Certificate No. 1250782, F23K 1/00, publ. . 08/15/1986). In such a fairly simple scheme with direct dust injection, the mill productivity determines the load of the boiler, and the efficiency of the latter, especially in variable conditions, largely depends on the fineness of the grinding of coal dust and the uniformity of the fractional composition.

The closest in its technical essence is the coal dust supply system for burning (USSR Author's Certificate No. 870862, IPC F23K 1/04, publ. 07.10.1981), including the feed lines for coal fuel and hot air, a device for separating ready-mixed air mixtures, the outlet pipes of which are connected by dust pipes to the burners of the boiler furnace.

The disadvantage of this system is that at the inlet and outlet of the dust collector, the pressure of the dusty air environment remains constant. Due to the fact that the burner devices are at different distances from the device for separation of finished dust, i.e. the aerodynamic drags of the dust ducts are different - accordingly, a different amount of air-fuel mixture enters the burner devices, which creates a bias in the combustion chamber of the boiler furnace and negatively affects the operation of the boiler as a whole.

The technical problem to which the present utility model is directed is to create a simple and reliable in operation pulverized fuel supply system that provides uniform division and regulation of the air mixture through the distributing dust pipelines. This allows you to optimize the combustion process due to the smoothness and uniformity of combustion of the air mixture (lack of distortions in the burner devices).

The task underlying the present utility model, with the achievement of the claimed technical result, is solved by the fact that in the coal dust supply system for combustion, which includes the feed lines of coal fuel and a drying agent connected to the grinding device, a device for separating air mixtures, the outlet pipes of which connected by distributing dust pipes to the burners of the boiler furnace, the device for separating the air mixture is made with the possibility of two-stage separation of the latter in each stage into two streams, p Institution from each other at a distance and are in mutually perpendicular planes, pyleprovody dispensers provided with fuel mixture control device resistance, and in the supply line of the drying agent flow dividers mounted.

In addition, the device for separating the air mixture is equipped with slide gate valves made with the possibility of controlled rotation.

In addition, the device for controlling the resistance of the air mixture is made in the form of a damper connected to a screw pair with the possibility of a controlled change in the cross section of the dust conduit.

In addition, the flow dividers of the supply line of the drying agent are made in the form of dividing plates equidistant from each other.

The implementation of the device for separating the air mixture with the possibility of two-stage separation in each stage into two streams, separated from each other at a distance and located in mutually perpendicular planes allows you to adjust the flow of the dust-air mixture into each dust pipe. depending on the required amount of dust for each burner, which provides clear control of the flow of dust-air mixture to the corresponding burners of the boiler furnace.

Providing the system with devices for regulating the resistance of air mixtures allows for smooth regulation of the aerodynamic resistance of dust pipelines.

The installation of flow dividers in the supply line of the drying agent makes it possible to evenly divide the air flow (flow of the drying agent) and to prevent the occurrence of the so-called “dead zone”.

A comparative analysis of the proposed technical solution with the identified analogues of the prior art, from which the utility model does not explicitly follow for a specialist in fire fighting equipment, showed that it is not known, but taking into account the possibility of industrial serial production of a locking and starting device.

The essence of the utility model and the possibility of its practical implementation are illustrated by drawings, where:

figure 1 shows a General view of the supply system of coal dust for combustion; figure 2 shows a device for dividing the aerosol (the first step along the medium);

figure 3 shows a device for dividing aerosol (second stage along the medium);

figure 4 shows the control unit of each stage of the device for dividing the air mixture;

figure 5 shows an individual device for regulating the resistance of air mixtures (node smooth regulation of the cross section of the dust pipe); figure 6 shows the currently existing node divider flow of a drying agent;

figure 7 shows the proposed site divider flow of the drying agent;

on Fig shows a cross section of the currently existing node divider flow of the drying agent (section aa) and the proposed (section bb).

In graphic materials, the corresponding structural elements of the coal dust supply system for combustion are indicated by the following positions:

1. - burner burner boiler;

2. - a device for controlling the resistance of air mixtures;

3. - distributing dust pipe;

4. - a device for dividing air mixtures;

5. - flow divider of the drying agent;

6. - separator;

7. - grinding device;

8. - supply line of a drying agent;

9. - feed lines for the initial fuel;

10. - gate device;

11.- knot of regulation of rotation of the gate device;

12. - handle;

13. - latch;

14. - guide rail;

15. - sealing device;

16. - gate valve;

17. - partition;

18. - slide gate;

19. - a knot for controlling the rotation of the gate valves;

20. - shutter;

21. - stock;

22. - sleeve nut;

23. - the puck;

24. - a persistent frame;

25. - scale;

26. - connecting flanges;

27. - housing of the mixture control device;

28. - separation plates.

The general scheme of the coal dust supply system for combustion is shown in FIG. 1 and includes a grinding device 7, a separator 6, a feed line for fuel 9, burner devices 1, distributing dust pipes 3, a feed line for a drying agent 8, and a device for dividing the air mixture 4 , individual devices for regulating the resistance of air mixtures in each specific dust distribution pipe 2 and a flow divider of the drying agent 5.

Mixture division device 4 is a straight section of the box containing two stages of the division of the dusty air, separated from each other at a distance and located in mutually perpendicular planes.

The first stage in the course of the medium divides the dusty air into two streams (figure 2) using a single gate device 10 with an individual node 11 of the rotation control.

The rotation control unit consists of a handle 12 (Fig. 4), a latch 13, a guide rail 14, a sealing device 15 that prevents the air mixture from leaking out and at the same time being a shaft attachment unit to which the gate valve 16 is attached.

Further, inside the transfer case there is a partition 17 to prevent mixing of the already separated two streams with each other. This is followed by the second stage of division of the aerosol. It represents two independent from each other gate valves 18 located in mutually perpendicular planes of the relative gate device 10 of the first stage of division of the air mixture (figure 2). Each damper of the second stage of division has its own node 19 of the rotation control (Fig.3) according to the principle of operation similar to the control unit of the first stage (Fig.4 pos.12 - 14).

The mixture control device 2 of the aerosol mixture is a regulatory body (figure 5), consisting of a shutter 20 connected to a screw pair: rod 21, nut-sleeve 22, connecting flanges 26, body 27. Turning the nut-sleeve 22 around its axis located in a threaded connection with the stem 21 with the shutter 20, we either raise or lower the shutter, thereby changing the cross section of the pipeline, and the washer 23. does not allow the sleeve nut 22 to leave the thrust frame 24. By changing the cross section of the pipeline, the resistance to movement a erosion in this section of the distributing dust pipe. For a more accurate control of the position of the rod-damper pair, smooth change in the cross section of the pipeline and resistance in this section of the dust transfer piping, there is a graduated scale of 25 from 0.5 to 1 on the body of the individual mixture control device 2 of the aerosol mixture; flow area (value 0.5) and a fully open section of the pipeline (value 1). The installation of an individual device is done with the stock upward with deviations up to 30 degrees from the vertical position.

The divider 5 of the flow of the drying agent (Fig.7) has in its cross section dividing plates 28, equidistant from each other. The specified solution allows you to evenly split the air flow (flow of drying agent), to eliminate the occurrence of the so-called "dead zone" (Fig.6). Differences in the movement of air flow without the proposed dividing plates in the cross section of the duct and with them are presented in Fig.6 and Fig.7. Evenly divided air flow (drying agent flow) allows the flow to be evenly distributed over the entire surface of the rotor of the grinding device, as a result covering a large useful drainage area, eliminating the occurrence of a “dead zone" and capturing a larger volume of coal particles along the length of the rotor of the grinding device, compared with the currently existing supply pipelines (boxes) of the drying agent without equidistant separation plates in the cross section of the path (Fig. 8 section e “AA”).

The coal dust supply system for combustion works as follows (see FIG. 1): the initial coal fuel enters through the feed line 9 to the grinding device 7. The source coal is dried and milled in a stream of a gaseous drying agent, which enters through the supply line 8 drying agent. Coal drying in the flow of the drying agent proceeds during its grinding in the grinding device 7, while the flow divider of the drying agent 5 for uniform removal of dust particles along the length of the rotor of the grinding device provides a uniform supply of the drying agent through separate channels.

Obtained after grinding coal, coal dust is carried out by the flow of a gaseous drying agent from the grinding device 7 and in the form of an aerodynamic medium (air mixture) is fed to the separator 6 and then to the air mixture division device 4, with two stages of regulating slide devices 10, 18 located in series (Fig. 2 , 3) to ensure the division and regulation of the flow of the aerodynamic medium, first into two streams, and then each of the two streams into two streams, while the division of the streams is carried out in mutually perpendicular planes bones. This allows you to evenly divide the total volume of aerosol by flows. Next, coal dust is fed into the dust pipes 3. Due to the possibility of controlling the device 2 for controlling the resistance of the air mixture with smooth regulation of the flow cross section of the dust pipe 3. It is possible to create resistance to the aerodynamic mixture at the starting point of each dust pipe 3 and to regulate the operation of the burner device 1 of the boiler furnace individually, in depending on the spatial geometric trajectory and the length of each dust pipe 3. All of the above technical solutions as a whole provide stable operation of burner devices 1 in particular and the boiler as a whole.

The proposed system is reliable in operation due to the simplicity and manufacturability of the design and has low energy consumption during operation.

Claims (4)

1. A system for supplying coal dust for combustion, including feed lines for coal fuel and a drying agent, connected to a grinding device, a device for separating the air mixture, the outlet pipes of which are connected by distributing dust pipes to the burners of the furnace of the boiler, characterized in that the device for separating the air mixture the possibility of two-stage separation of the latter in each stage into two streams, separated from each other by a distance and located in mutually perpendicular planes, s pyleprovody aeromixture provided with resistance regulation devices, and the supply line of the drying agent flow dividers mounted. 2. The system according to claim 1, characterized in that the device for separating the air mixture is equipped with slide gates made with adjustable rotation. 3. The system according to claim 1, characterized in that the device for regulating the resistance of the air mixture is made in the form of a damper connected to a screw pair with the possibility of a controlled change in the cross section of the dust pipe. 4. The system according to claim 1, characterized in that the flow dividers of the supply line of the drying agent are made in the form of dividing plates.