JP2001074392A - Steel ball spraying dust remover for heat exchanger - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a steel ball spraying dust remover for heat exchanger in which a hopper is prevented from wearing away by absorbing the falling energy of steel balls. SOLUTION: A steel ball stop plate 13 is provided at the steel ball collecting opening part at the lower part of the lower hopper 11 of a heat exchanger 5 and one or more steel ball layer 12 is formed at the inclining part on the inner surface of the hopper 11. Consequently, impact of falling steel balls 10 onto the inner surface of the hopper 11 is lessened while lessening wear thereof significantly. Since the steel balls 10 are sprayed constantly to the heating tubes of the heat exchanger 5 and fall constantly onto the inner surface of the hopper 11, a new steel ball layer 12 can be formed immediately through bridge between the steel balls when it is broken.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger installed at an outlet of a combustion device such as a boiler or the like, and relates to a steel ball spraying equipment using a steel ball as a system for removing soot and dust attached to a heat transfer tube group. The present invention relates to a heat exchanger lower hopper structure for preventing wear of a hopper by a ball.

[0002]

2. Description of the Related Art FIG. 3 shows an example of a gas-gas heater heat exchanger employing a steel ball dusting apparatus. The steel balls 10 supplied from the supply feeder 1 to the steel ball distributor 2 are sent to the steel ball disperser 4 through the steel ball trays 3 arranged in parallel.
Several dozens of steel ball dispersers 4 are installed above the horizontally arranged heat exchanger 5 according to the gas passage area of the heat exchanger 5.

[0003] The steel ball distributor 2 has a rotating chute 6. When the chute 6 is connected to the steel ball tray 3, the steel ball 10 falls on the steel ball disperser 4, and the steel ball 10 drops. 1
0 spreads appropriately and collides with the surface of the heat transfer tube of the heat exchanger 5 to remove dust attached to the surface of the heat transfer tube by the impact force. The steel ball 10 that has passed through the heat exchanger 5 and the dust falling along with the steel ball 10 are separated from the steel ball 10 by the dust separator 7 and sent to the steel ball transporter 9 via the steel ball discharger 8. The process returns to the supply feeder 1 again.

The lower part of the conventional heat exchanger 5 has nothing to block the falling of the steel ball 10, and the steel ball 10 passing through the heat exchanger 5 is directly connected to the hopper 11 having the ash repose angle (about 45 degrees). It collides with the side wall and is guided to the dust separator 7.

[0005]

In the above prior art, no consideration has been given to the wear of the hopper 11 due to the free fall of the steel ball 10 from the lower part of the heat exchanger 5 to the hopper 11 and collision with the hopper 11. . The object of the present invention is to
It is an object of the present invention to provide a heat exchanger for spraying and removing steel balls of a heat exchanger, which absorbs energy caused by falling of steel balls and prevents wear of a hopper.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to disperse steel balls from above a heat transfer tube group of a heat exchanger installed in a gas passage at an outlet of a combustion device such as a boiler. A dust removing apparatus for spraying steel balls of a heat exchanger for removing soot adhering to a hopper provided at a lower portion of the heat transfer tube group for collecting steel balls, and at least one layer formed on the surface of the hopper. The problem is solved by a steel ball dusting apparatus of a heat exchanger having a steel ball layer comprising:

In order to form a steel ball layer on the surface of the hopper, it is desirable to install a stop plate for one layer of steel balls on the hopper surface near the hopper outlet.

[0008]

[Action] A steel ball stopper is installed at the lower steel ball collection port of the lower hopper of the heat exchanger, and one or more steel ball layers are formed on the inclined portion of the inner surface of the hopper. The impact on the inner surface is reduced, and at the same time, the wear on the inner surface of the hopper can be significantly reduced. In addition, since the steel balls are constantly sprayed on the heat exchanger tubes of the heat exchanger and always fall on the inner surface of the hopper, even if the formed steel ball layers are broken, a new layer can be formed immediately by the bridge between the steel balls. It is possible.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an apparatus for dusting and removing steel balls of a heat exchanger according to an embodiment of the present invention, and FIG. 2 shows an enlarged view of a hopper portion thereof. Steel ball distributor 2 from supply feeder 1
Are sent to the steel ball disperser 4 through the plurality of steel ball trays 3. The steel ball dispersers 4 are provided on the horizontally arranged gas gas heater heat exchanger 5 in several tens of places according to the gas passage area of the heat exchanger 5.

Further, the steel ball distributor 2 has a rotating chute 6. When the chute 6 is connected to the steel ball tray 3, the steel ball 10 falls on the steel ball disperser 4, and 1
0 spreads appropriately, collides with the surface of the heat transfer tube of the heat exchanger 5, and removes dust attached to the surface of the heat transfer tube by the impact force. The steel ball 10 that has passed through the heat exchanger 5 and the dust that falls along with the steel ball 10 collide with the steel ball layer 12 formed on the inner surface of the hopper 11. As shown in FIG. 2, the steel ball layer 12 is formed by receiving the steel balls 10 that sequentially fall by the stopper plate 13 provided at the outlet of the hopper.

The impact of the steel ball 10 against the steel ball layer 12 when the steel ball 10 falls onto the hopper 11 itself is attenuated, and the wear on the inner surface of the hopper 11 can be greatly reduced. Even if the steel ball layer 12 is broken, it is immediately re-formed by the steel balls 10 that always fall, so that it is a so-called self-supply type in which the system can be easily restored. In addition, since the medium for preventing wear is the steel ball 10 itself, there is an advantage that other consumables are not required.

The steel ball 10 dropped on the steel ball layer 12 of the hopper 11 is then supplied to the dust separator 7 along the inner surface of the hopper 11 to separate the dust from the steel ball 10, and
Is sent to the steel ball transporting machine 9 via the steel ball discharging machine 8 and returned to the supply feeder 1 again for reuse.

[0013]

According to the present invention, the impact of the falling steel balls on the inner surface of the hopper is reduced by one or more steel ball layers provided on the inclined inner surface of the lower hopper of the heat exchanger. Significantly reduces wear.

[Brief description of the drawings]

FIG. 1 is a schematic view of a steel ball spraying and dust removing device of a heat exchanger according to an embodiment of the present invention.

FIG. 2 is an enlarged view of a heat exchanger hopper of FIG.

FIG. 3 is a schematic view of a conventional apparatus for spraying and removing steel balls of a heat exchanger.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Supply feeder 2 Steel ball distribution machine 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 11 Hopper 12 Steel ball layer 13 Stop plate

Claims (2)

[Claims] 1. A heat exchanger for spraying steel balls from above a heat transfer tube group of a heat exchanger installed in a gas flow path at an outlet of a combustion device such as a boiler to remove soot and dust adhering to the heat transfer tube. What is claimed is: 1. An apparatus for dusting and removing steel balls, comprising: a hopper provided below the heat transfer tube group for collecting steel balls; and a steel ball layer comprising at least one layer formed on the surface of the hopper. Heat exchanger dusting equipment for heat exchanger. 2. The steel for a heat exchanger according to claim 1, wherein a stop plate for one layer of steel balls is provided on the hopper surface near the hopper outlet in order to form a steel ball layer on the hopper surface. Ball dusting equipment.