RU76425U1 - COAL DUST FEEDING SYSTEM - Google Patents

Abstract

The utility model is aimed at creating a simple and reliable in operation system for supplying pulverized fuel, providing accurate fuel supply continuously. This object is achieved by the fact that in the coal dust supply system for combustion, including the feed coal and hot air supply lines connected to the grinding device, a device for separating finished dust, the outlet pipes of which are connected by dust pipes to the burners of the boiler furnace, a device for separating finished dust equipped with disk dividers installed in front of the outlet pipes and made with the possibility of controlled rotation. The difference between the proposed system and the known ones is that in the device for separating the finished dust, the supply of the dust-air mixture to each dust pipe is regulated, depending on the required amount of dust to the burners, which provides clear control of the fuel consumption for the corresponding burners of the boiler furnace. 2 C.p.F., 6 ill.

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 (USSR Author's 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 supply line of the original coal fuel and hot air connected to the grinding device, a device for separating the finished dust, 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 boiler load, and the efficiency of the latter, especially in variable modes, largely depends on the fineness of coal dust grinding 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 supply lines for the initial coal fuel and hot air, a device for separating finished dust, the weekend the nozzles 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. aerodynamic drag

dust duct paths are different - accordingly, a different amount of air-fuel mixture enters the burner devices, which creates a skew of combustion in the furnace chamber of the boiler furnace and adversely affects the operation of the boiler as a whole.

The utility model is aimed at creating a simple and reliable in operation system for supplying pulverized fuel, providing accurate fuel supply continuously, easily controlled and requiring no maintenance.

The problem is solved in that in a system for supplying coal dust for combustion, including feed lines for coal and hot air connected to a grinding device, a device for separating finished dust, the outlet pipes of which are connected by dust pipes to the burners of the boiler furnace, a device for separating finished dust equipped with disk dividers installed in front of the outlet pipes and made with the possibility of controlled rotation.

In addition, the device for separating the finished dust is equipped with at least two outlet pipes.

In addition, the device for separating the finished dust is equipped with a unit for controlling the rotation of the disk dividers, and the latter are made with segment cutouts.

The difference of the proposed system from the existing ones is that in the device for separating the finished dust, the supply of the dust-air mixture to each dust pipe is regulated, depending on the required amount of dust to the burners, which provides a clear control of the flow of dust-air mixture to the corresponding burners of the boiler furnace.

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

Fig. 1 shows a general view of the coal dust supply system for combustion;

figure 2 is the same; an embodiment of a device for separating finished dust with four outlet nozzles;

figure 3 shows a device for separating finished dust;

figure 4 is the same top view;

figure 5 - the same for the four pipe versions of the device for separation of finished dust;

figure 6 shows the control unit rotation of the disk dividers.

Next, the present utility model will be described in more detail with reference to the drawings, which depict the following.

The proposed system of supplying coal dust for combustion includes a feed coal feed line 1 and a hot air supply line 2, a grinding device (tangential hammer mill) 3 and a device 4 for separating the finished dust sequentially located in the technological chain, shut-off valves 5, dust pipes 6, burners 7 and boiler furnace 8.

The device 4 for separation of the finished dust contains a conical body 9 with a cylindrical lower 10 and upper 11 parts, a flow divider 12, radial inspection pipes 13 and outlet pipes 14. Inside the housing, peripheral 15 and central 16 channels are formed for passage of the dust-air mixture, connected by windows 17, and in front of the outlet pipes 14, disk dividers 18 with segment cutouts are mounted, rotatable from the rotation control unit 19.

The control unit of rotation 19 of the disk dividers 18 contains a rail guide 20, the handle is a latch 21 and a sealing device 22.

The coal dust supply system for combustion works as follows: the initial coal fuel enters through a tangential hammer mill 3 through a supply line 1. Drying and grinding of the initial coal is carried out in a gaseous drying agent stream, which enters through a hot (primary) air supply line 2

Coal drying in the flow of the drying agent proceeds during its grinding in the mill 3. The coal dust obtained after the grinding of coal is carried out by the gaseous drying agent stream from the mill 3 and in the form of an air-fuel mixture is supplied to the finished dust separation device 4, in which the general dust-air mixture flow is separated using a flow divider 12 (Fig.3. Fig.4) into 2 channels - the central 16 and peripheral 15.

The central stream 16 of the dust-air mixture is designed to equalize the total pressure of the dust-air mixture at the starting point of the dust pipes. The division of coal dust into dust pipes (burner devices) occurs in the peripheral stream 15 due to the windows 17, which

are in close proximity to each of the outlet pipes 14, coaxially with them.

The regulation of the flow of dusty air in the device 4 for separation of finished dust occurs using the control unit 19 (Fig.6), which allows you to directly control the process of regulating the air-fuel mixture and fixing in the required position of the disk divider 18.

Due to the ability to control the disk dividers 18, it is possible to create resistance of the dust-air mixture at the starting point of each of the dust pipes 6 and to regulate the operation of the burner device 7 of the boiler furnace 8 individually, depending on the spatial path and length of each dust pipe 6, which ensures stable operation of the burner devices 7 in particular, and the boiler as a whole. Segment disk dividers 18 have the ability to overlap the openings of the outlet pipes 14 in the range of 0-30% of the normal open position, thereby creating a different passage section of the outlet pipes 14 and providing in the required volumes the flow of dust-air mixture to each burner device 7 into the furnace of boiler 8.

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

Claims (3)

1. A system for supplying coal dust for combustion, including feed lines for coal and hot air connected to the grinding device, a device for separating finished dust, the outlet pipes of which are connected by dust pipes to the burners of the boiler furnace, characterized in that the device for separating finished dust is provided disk dividers installed in front of the outlet pipes and made with the possibility of adjustable rotation. 2. The system according to claim 1, characterized in that the device for separating the finished dust is equipped with at least two outlet pipes. 3. The system according to claim 1, characterized in that the device for separating the finished dust is equipped with a unit for controlling the rotation of the disk dividers, and the latter are made with segment cutouts.