JPH08313194A - Steel ball scattering apparatus - Google Patents

Abstract

PURPOSE: To enable lowering of the height of a hopper according to a width of the hopper divided by diving the hopper in the axial direction thereof while being connected to a steel ball transporting device through a conveyor provided therebelow almost in the horizontal way. CONSTITUTION: Steel balls which are lifted by a steel ball transporting device 4 to be scattered from scattering devices 2 on a heat exchanger 1 drop together with soots passing between heat exchanger tubes working the soots off the surface of an electrically heating tube in the heat exchanger 1. Then, the steel balls are gathered by a hopper 7a divided across the width thereof as set below the heat exchanger 1 to be fed into a rotary type screw conveyor 8 provided below the hopper 7a so that dust is separated by hot air for separating dust and the steel balls alone are lifted above the heat exchanger 1 again by the steel ball transporting device 4 to be circulated. This enables lowering of the height of the hopper 7a according to the width of the hopper 7a divided thereby curtailing a space capacity necessary for the setting of this steel ball scattering apparatus.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel ball spraying device applied to the removal of dust such as a gas-gas heat exchanger installed in a flue gas desulfurization device of a coal-fired boiler.

[0002]

2. Description of the Related Art FIG. 3 is an explanatory view of a conventional steel ball spraying device used for removing dust from a gas-gas heat exchanger installed in a flue gas desulfurization device of a coal-fired boiler. In the figure, the steel balls lifted by the steel ball transporter 4 and sprayed from the disperser 2 above the heat exchanger 1 pass between the heat transfer tubes while removing dust on the surface of the heat transfer tubes in the heat exchanger 1. Soot and dust fall together. Then, after being collected by a pyramid-shaped hopper 7 installed below the heat exchanger 1, it is put into a rotary type dust separator 5 and dust is separated by hot air for dust separation. The steel ball transporting machine 4 again lifts the heat exchanger 1 upward to circulate it. Reference numeral 3 in the drawing is a steel ball distributor, 6
Is a steel ball feeder.

[0003]

In the conventional steel ball sprinkling device as described above, the pyramid-shaped hopper 7 installed below the heat exchanger 1 has the same width as the entire heat exchanger 1, and It is also necessary to provide an inclination so that the steel balls containing soot and dust falling from the heat exchanger 1 flow down. Therefore, for example, when the width of the heat exchanger 1 is 10 m, the pyramidal hopper 7 has a height of about 8.7 m, which requires a large space for installing the steel ball spraying device. Further, since the height of the entire heat exchanger 1 is also high, the height of the steel ball transport machine 4 is accordingly high.

[0004]

A steel ball spraying device according to the present invention is intended to solve the above problems. A steel ball transporter lifts a steel ball, sprays it from above, and receives it by a hopper provided below. In the steel ball spraying device for lifting and spraying again by the steel ball transporter, the hopper is divided in the width direction and is connected to the steel ball transporter via a conveyor provided in a substantially horizontal direction below. It is characterized by the structure.

[0005]

That is, in the steel ball spraying device according to the present invention,
The steel balls are lifted by a steel ball transporter, sprayed from above, received by a hopper provided below, and again lifted by a steel ball transporter to be sprayed. It is connected to the steel ball transporter via a horizontal conveyor, and by dividing the hopper in the width direction, the height of the hopper decreases according to the divided width, and the height is divided. Depending on the number, for example, if it is divided into four, the height will be 1/4. The soot dust and steel balls discharged from each of the divided hoppers are put into a conveyor provided in a substantially horizontal direction below each hopper,
It is sent to a steel ball carrier and circulated.

[0006]

1 and 2 are explanatory views of a steel ball sprinkling device according to an embodiment of the present invention. In the figure, the steel ball spraying device according to the present embodiment is used for removing soot and dust of a gas-gas heat exchanger installed in a flue gas desulfurization device of a coal-fired boiler. The steel balls lifted by the machine 4 and sprayed from the disperser 2 above the heat exchanger 1 drop between the heat transfer tubes and drop with the soot particles while dropping the soot particles on the surface of the heat transfer tubes in the heat exchanger 1. And, the hopper 7 which is installed below the heat exchanger 1 and which is divided in the width direction.
After being collected in a, the rotary type screw conveyor 8
The dust is separated by hot air introduced into the inside and separated by hot air for dust separation, and only the steel balls are again lifted above the heat exchanger 1 by the steel ball transporter 4 and circulated. Reference numeral 3 in the drawing is a steel ball distributor, and 6 is a steel ball feeder.

The hopper 7a divided in the width direction is a rotary type screw conveyor 8 which is horizontally provided below.
The steel balls and soot particles falling from the heat exchanger 1 are collected and thrown into the steel ball transporter 4. As shown in FIG. 2, the screw conveyor 8 is provided with an inlet 15 for the steel balls to be introduced from the hopper 7a in the middle so that the whole is wrapped with warm air and no dew condensation occurs. In addition, the inner cylinder 12 is rotatably supported on the outer circumference by a support device 14, and spiral blades are fixed to the inner circumference, and is driven by a drive device 13 to rotate. Hot air for dust separation is injected into the casing 11 from the direction opposite to the moving direction of the steel balls to separate the steel balls from the dust.

The steel balls lifted by the steel ball transporter 4 are sprayed from above the heat exchanger 1 by the disperser 2 through the steel ball distributor 3 and fall while dropping the dust particles adhering to the surface of the heat transfer tube. Collected in the hopper 7a divided in the width direction below the heat exchanger 1 together with the dust that has been dropped. The bottom of each of the divided hoppers 7a is connected to a horizontally provided screw conveyor 8, and the steel balls and soot and dust falling from the heat exchanger 1 are discharged from each hopper 7a and a plurality of charging ports 15 are provided. Is loaded into the screw conveyor 8 and carried by the screw conveyor 8 to transport the steel ball transporter 4
Sent to. By dividing the pyramid-shaped hopper below the heat exchanger 1 in this way, the height of each of the divided hoppers 7a becomes a height according to the divided width. That is, the height of each of the divided hoppers 7a is, for example, 4 according to the number of the divided hoppers.
If divided, the height will be 1/4.

In the conventional steel ball spraying device, the pyramid-shaped hopper installed below the heat exchanger has the same width as the entire heat exchanger, and the steel containing soot and dust falling from the heat exchanger. It is also necessary to provide an inclination so that the sphere runs down. Therefore, for example, when the width of the heat exchanger is 10 m, the pyramidal hopper has a height of about 8.7 m, which requires a large space for installing the steel ball spraying device. Further, since the height of the entire heat exchanger is also high, the height of the steel ball transporting machine is also correspondingly high, but in the steel ball spraying device according to the present embodiment, the pyramidal shape below the heat exchanger 1 is used. The height of each hopper 7a divided by dividing the hopper becomes 1/4 the height in the case of, for example, four divisions according to the number of divisions. For example, when the hopper 7a having a width of 10 m is divided into four, the height of the hopper that requires 8660 mm in the conventional steel ball spraying device is 2160 mm, which is 6500 mm lower, and the required height of the rotary screw conveyor 8 is reduced. Even if the size is subtracted, the height of the entire device is significantly reduced. In this way, the height of the entire equipment in the steel ball spraying device is, for example, 65
By reducing the height by 00 mm, not only the space for installing the entire equipment is reduced, but also the length of the outside of the steel ball transporting machine 4, ducts, pipes, etc. is reduced, resulting in great cost reduction.

[0010]

The steel ball sprinkling device according to the present invention is constructed as described above, and the height of the hopper becomes lower according to the width of the divided hopper, so that the space required for installing the steel ball sprinkling device. In addition to reducing the volume, the length of steel ball transport machines, ducts, pipes, etc. will also be reduced, reducing equipment costs.

[Brief description of drawings]

FIG. 1 is a flow chart of a steel ball spraying device according to an embodiment of the present invention.

FIG. 2 (a) is a front view of the hopper, and FIG. 2 (b).
Is a cross-sectional view of the screw conveyor, and FIG. 6C is a detailed view of a C portion in FIG.

FIG. 3 is a flow chart of a conventional steel ball sprinkling device.

[Explanation of symbols]

 1 Heat Exchanger 2 Disperser 3 Steel Ball Distributor 4 Steel Ball Transporter 6 Steel Ball Feeder 7a Hopper 8 Rotary Screw Conveyor 11 Casing 12 Inner Cylinder 13 Drive Device 14 Support Device 15 Steel Ball Inlet

Claims (1)

[Claims] 1. A steel ball spraying device in which steel balls are lifted by a steel ball transporter to be sprayed from above, received by a hopper provided below, and again lifted and sprayed by the steel ball transporter, wherein the hopper is widthwise. A steel ball spraying device, characterized in that it is divided and is connected to the above-mentioned steel ball transporting machine via a conveyor provided in a substantially horizontal direction below.