JP2001082894A - Heat exchanger shot cleaning apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shot cleaning apparatus with high reliability and with a simplified system by eliminating installation of a low reliability rotary screw feeder. SOLUTION: A steel ball tank 11 has a capacity capable of keeping the whole amount of steel balls in a system. and a necessary amount is discharged from a steel ball supplier 16 and is guided into a steel ball circulation system (a system comprising: a steel ball transportation device 9, a steel ball, a steel ball distributor for distributing steel balls, a steel ball supply line 10 and dust separator 7, and a steel ball discharge chute 17). Steel balls guided into the steel ball circulation system are sprinkled to a heat exchanger 5 through a chute 6. Thereupon, the amount of sprinkling can be determined by opening closing a bypass chute valve 15 without the use of prior art rotary screw feeder. The steel ball discharge chute 17 is of an inclination type, so that it is possible to supply steel ball to the steel ball transportation device 9 with the acid of the self weight of the steel walls. It is herein possible to eliminate the prior art rotary screw feeder. Hereby, the need of a supply feeder installed on an upper portion of a GGH heat exchanger is eliminated, so that the overall height of the apparatus becomes low. in the prior art technique. The entire height of the apparatus is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shot cleaning apparatus which is effective for removing dust from a heat exchanger tube of a heat exchanger such as a gas gas heater for a coal-fired boiler flue gas desulfurization apparatus.

[0002]

2. Description of the Related Art A shot cleaning device has been put into practical use as a dust removing device attached to a heat exchanger such as a gas gas heater for a coal-fired boiler flue gas desulfurization device. FIG. 2 shows an example of this prior art shot cleaning apparatus.

In the shot cleaning apparatus shown in FIG. 2, steel balls are supplied from a feeder 1 to a steel ball distributor 2. The steel ball distributor 2 has a rotating chute 6. When the chute 6 is connected to the steel ball tray 3, the steel balls pass through the steel ball tray 3 and are disposed on the heat exchanger 5. Sent to the vessel 4. The steel balls are dispersed and dropped by the steel ball disperser 4 onto the horizontally arranged heat exchanger 5, collide with the heat transfer tube surface of the heat exchanger 5, and remove dust attached to the surface by the impact force. The steel balls falling through the heat exchanger 5 and the dust falling accompanying the steel balls are separated by the dust separator 7 and the dust is collected. The steel balls separated from the dust by the dust separator 7 are sent to a steel ball transporter 9 that pumps up the steel balls by rotation of a motor 14 via a steel ball discharger 8, and are sent from the steel ball transporter 9 to the supply feeder 1 again. Be reused.

[0004]

The conventional shot cleaning apparatus shown in FIG. 2 transports steel balls in the system by a steel ball transporting device including a supply feeder 1, a steel ball tank feeder 12, and a steel ball discharger 8. I was In particular, the supply feeder 1 is a source of spraying steel balls, and required high reliability.

[0005] Rotary screw feeders are used in these steel ball transport devices, and these have had problems in screw wear and reliability due to the steel balls.

For example, when increasing the amount of steel balls to be scattered, steel balls separately stored in a steel ball tank 11 are supplied to a steel ball discharger 8 via a steel ball tank feeder 12 of a screw feeder type. An additional supply to the circulation system was used to determine the amount of steel ball sprayed. When reducing the amount of sprayed steel balls, only the supply feeder 1 is temporarily stopped or decelerated, and a part of the steel balls is withdrawn from the steel ball circulation system into the steel ball tank 11 via the bypass chute 13 and stored. The amount of steel ball scatter was determined by reducing the amount of steel ball circulation in the steel ball circulation system.

However, in the rotary screw feeder used for the supply feeder 1 and the steel ball tank feeder 12, the steel balls may be engaged with the screw, so that the screw may be worn, and there is a problem in the reliability of the equipment. Was. In addition, a rotary screw feeder is also used for the steel ball discharger 8, which has the same problem.
Further, since the supply feeder 1 is installed on the upper part of the heat exchanger 5, the steel ball transporter 9, the bypass chute 13 and the supporting steel frame of the heat exchanger 5 are increased, and there is a problem that the cost of equipment is increased. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a shot cleaning apparatus which has high reliability by simplifying the system by omitting installation of a rotary screw feeder which is not highly reliable.

[0009]

SUMMARY OF THE INVENTION An object of the present invention is to provide a heat exchanger shot cleaning apparatus for spraying steel balls on a heat exchanger tube of a heat exchanger to remove dust adhering to the heat exchanger tube. A steel ball transporter that transports the steel ball, a steel ball disperser that scatters the steel balls sent from the steel ball transporter, a steel ball supply line between the steel ball transporter and the steel ball disperser, After the steel balls scattered from the ball disperser are dropped on the heat exchanger tubes of the heat exchanger, the collected steel balls are separated from dust by a dust separator, and the steel balls separated by the dust separator are sent to a steel ball transporter. A steel ball discharge chute, a bypass line for returning the steel balls provided in the steel ball supply line to the steel ball transporter without being sprayed to the heat exchanger, and a steel ball bypass amount to the bypass line provided in the steel ball supply line Heat exchanger shot cleaning with means for adjusting the temperature It is solved by location.

The bypass line can be provided with a steel ball tank for storing steel balls and a steel ball feeder for adjusting the quantity of steel balls to the steel ball transporter. It is desirable to use an inclined chute for guiding the steel ball to the steel ball transporter by its own weight.

[0011]

The operation of the present invention will be described with reference to the heat exchanger shot cleaning apparatus shown in FIG. However, the present invention is not limited to the device shown in FIG.

The steel ball transporter 9 is operated at a constant speed.
The steel ball tank 11 has a capacity capable of holding the entire amount of steel balls in the system, discharges a necessary amount from the steel ball feeder 16 and guides the steel ball into the steel ball circulation system. The steel balls guided into the steel ball circulation system are scattered through the chute 6 to the heat exchanger.
It is possible to determine the amount of spraying by opening and closing, and it is possible to determine the amount of steel ball spraying without using a rotary screw feeder as in the prior art. Also, an inclined steel ball discharge chute 17 is installed between the dust separator 7 and the steel ball transporter 9 so that the steel ball can be supplied to the steel ball transporter by its own weight. The screw feeder can be omitted. This eliminates the need for the feeder 1 installed in the upper part of the GGH heat exchanger in the prior art, and reduces the overall height of the apparatus.

[0013]

FIG. 1 shows an example of a shot cleaning apparatus according to an embodiment of the present invention. 1 that are the same as those shown in FIG. 2 indicate the same devices.

The steel balls are supplied from the steel ball distributor 2 to the heat exchanger 5 via the steel ball tray 3. The steel ball distributor 2 has a rotating chute 6. When this chute 6 is connected to the steel ball trays 3 distributed to several tens of places according to the gas passage area, the steel balls pass through the steel ball trays 3. It is sent to the steel ball disperser 4 installed on the exchanger 5. Steel ball is steel ball disperser 4
The steel is dispersed and falls on the horizontally arranged heat exchanger 5, collides with the heat transfer tube surface of the heat exchanger 5, removes dust attached to the surface by the impact force, and passes through the heat exchanger 5. The ball falls, and the dust falling along with the steel ball is also collected in the dust separator 7. The dust separated from the steel balls by the dust separator 7 is collected. On the other hand, the steel ball is sent from the dust separator 7 to the steel ball transporter 9 via the inclined steel ball discharge chute 17, and the steel ball supply line 10 provided between the steel ball transporter 9 and the steel ball distributor 2. And returns to the steel ball distributor 2 for circulation.

1 is characterized by a steel ball supply line 10.
Is provided with a bypass chute 13 for returning the steel balls to the steel ball transporter 9. A bypass chute valve 15 is provided at a bypass chute branch of the steel ball supply line 10, and the bypassed steel ball is guided to a steel ball tank 11 before returning the steel ball to the steel ball transporter 9. A steel ball feeder 16 is provided below the steel ball tank 11 to adjust the amount of steel ball circulation into the system.

As a dust removing device such as a gas gas heater (heat exchanger) 5 for a coal-fired boiler flue gas desulfurization device, the shot cleaning device shown in FIG. 1 has high reliability used in the conventional device shown in FIG. A rotary screen feeder is omitted, and a bypass chute valve 15 of a set of cylinders is installed at a branch portion of the bypass chute 13, and the amount of steel balls sprayed can be adjusted by opening and closing the bypass chute valve 15. Further, the installation of the rotary screw feeder described with reference to FIG. 2 is omitted, and a slide gate type or vibration type steel ball feeder 16 is installed, so that the device has high reliability. In addition, since the inclined steel ball discharge chute 17 that is discharged by the weight of the steel ball is installed, the device is highly reliable without clogging.

As a result of omitting the rotary screw feeder according to the above configuration, the shot cleaning apparatus shown in FIG. 1 has a steel ball transporter 9, a bypass chute 13, and a supporting steel frame for the heat exchanger 5 which are about one unit smaller than the apparatus shown in FIG. 0.5 to 3 m, and the entire apparatus can be simplified and made compact.

[0018]

According to the present invention, a rotary screw feeder generally used in a shot cleaning apparatus can be omitted, and a highly reliable apparatus can be provided. Furthermore, it is possible to lower the entire device,
The device can be simplified and made compact.

[Brief description of the drawings]

FIG. 1 is a device configuration diagram of a shot cleaning device according to the present invention.

FIG. 2 is a device configuration diagram of a conventional shot cleaning device.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 supply feeder 2 steel ball distributor 3 steel ball tray 4 steel ball disperser 5 heat exchanger 6 chute 7 dust separator 8 steel ball discharger 9 steel ball transporter 10 steel ball supply line 11 steel ball tank 12 steel ball tank feeder 13 bypass chute 14 steel ball transport motor 15 bypass chute valve 16 steel ball feeder 17 steel ball discharge chute

Claims (3)

[Claims] 1. A heat exchanger shot cleaning device for spraying steel balls on heat transfer tubes of a heat exchanger to remove dust adhered to the heat transfer tubes, comprising: a steel ball transporter for transferring steel balls; A steel ball disperser for dispersing steel balls sent from a ball transporter, a steel ball supply line between the steel ball transporter and the steel ball disperser, and a heat exchange between the steel balls dispersed from the steel ball disperser. After dropping on the heat transfer tube of the vessel, the collected steel balls are separated from dust by a dust separator; the steel balls separated by the dust separator are sent to a steel ball transporter; A bypass line for returning the provided steel balls to the steel ball transporter without spraying the heat exchangers,
A heat exchanger shot cleaning apparatus, characterized in that a means for adjusting the amount of steel ball bypass to the bypass line provided in the steel ball supply line is provided. 2. The heat pump according to claim 1, wherein the bypass line is provided with a steel ball tank for storing steel balls and a steel ball feeder for adjusting the amount of steel balls to the steel ball transporter. An exchange shot cleaning device. 3. The heat exchanger shot cleaning apparatus according to claim 1, wherein the steel ball discharge chute is an inclined chute for guiding the steel ball to the steel ball transporter by its own weight.