JPH0763494A - Steel sphere distributor - Google Patents

Abstract

PURPOSE:To provide a steel sphere distributor for a steel sphere scattering type dust removing apparatus in which soot dust adhered to a heat transfer surface of a heat exchanger can be removed. CONSTITUTION:A rotary chute 5 distributes steel spheres to a plurality of steel sphere distribution ports 1 provided at an outer periphery of a lower body via a plurality of steel sphere receivers 3a, 3b while rotating the balls at a high speed via a driver 6. As compared with a conventional apparatus, the spheres are distributed in a very short period, and hence a similar result to that the spheres can be uniformly and continuously distributed to be similarly all the ports 1 is obtained. Since part 3a of the plurality of sphere receiving units are larger in an insertion opening area than that of the other 3b, many spheres are concentrically scattered to a specific part of a heat exchanger, and a large quantity of soot dust stuck is also effectively removed. When sphere receivers 3a, 3b are rotated by the driver 7, a heat exchanger in which many spheres are concentrically scattered is sequentially moved, and hence soot dust adhered in a large quantity can be effectively removed in an entire heat exchanger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel ball distributor of a steel ball spraying type dust removing device for removing soot dust adhering to the surface of a heat transfer tube of a heat exchanger such as an exhaust gas economizer.

[0002]

2. Description of the Related Art FIG. 5 is a conceptual diagram showing an example of a heat exchanger incorporating a steel ball spraying type dust removing device. A plurality of steel ball dispersers (14) are provided above the heat transfer tube group (12) installed in the main casing (11). Hot gas containing soot and dust is introduced from the upper part of the main casing (11),
After passing through the heat transfer tube group (12) to perform heat exchange, it exits from the lower part of the main body casing (11). At this time, the soot dust contained in the gas adheres to the surface of the heat transfer tube, but the steel balls distributed by the steel ball distributor (13) become the steel ball disperser (14).
Then, the soot dust and the like that have been sprayed onto the heat transfer tube group (12) are removed, and the heat transfer tube group (12) falls. Then the rotary separator (1
In 5), the soot dust adhering to the steel balls is separated, and the cleaned steel balls are conveyed upward by the steel ball transporter (16),
It is returned to the steel ball distributor (13) again and circulated.

FIG. 6 is a perspective view showing an example of a conventional steel ball distributor. (08) is a steel ball charging port provided in the upper part,
Reference numeral (05) is a rotary chute which is provided inside and supplies a steel ball downward while rotating at a low speed by a drive unit (06),
Reference numeral (01) is a steel ball distribution port provided in plural on the outer periphery of the lower portion and connected to each steel ball disperser by a distribution pipe (02). The steel balls introduced from the steel ball inlet (08) are sequentially distributed over the entire circumference by the rotating chute (05), and the steel balls are sprayed periodically on each heat transfer tube group (12).

[0004]

For example, when a heat exchanger is installed on the upstream side of the electrostatic precipitator in order to lower the temperature of the gas in the inlet of the electrostatic precipitator, the dust concentration in the gas is very high, and therefore a large amount of heat is transferred to the heat transfer tube. Soot and dust will adhere. In such a case, if the conventional steel ball distributor shown in FIG. 6 is used to spray the steel balls from the steel ball disperser, each heat transfer tube group is only periodically sprayed with the steel balls to remove dust. During this period, the heat transfer performance may be sharply reduced due to the attachment of dust, and finally the heat transfer tube part may be blocked. In order to prevent such a decrease in heat transfer performance, steel balls may be continuously sprayed over the entire heat transfer tube group,
In order to do so, it is necessary to circulate and spray a large amount of steel balls, and there are problems such as increased wear of the equipment of the steel ball circulation line due to the steel balls and increased cost. Further, when a small amount of steel balls are continuously sprayed, the dust removal capacity is insufficient and it becomes difficult to maintain the heat transfer performance for a long time.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a steel ball distributor of a steel ball spraying type dust removing device for removing soot dust adhering to the heat transfer surface of a heat exchanger,
A plurality of distribution ports which are arranged along the circumference of a circle in a horizontal plane and have the same opening area on the upper surface, an upper end which communicates with each of the plurality of distribution ports, and a lower end which is a steel ball disperser above the heat exchanger. Distribution pipes and the same number of distribution ports along the circumference of a circle adjacent above the distribution port, and can rotate at a low speed around a vertical axis passing through the center of the circle, and has an inlet opening area on the upper surface. Some of them are larger than others, and the outlet opening areas of the lower surface are all the same, and they are arranged above the steel ball receiver and can rotate at high speed around the vertical axis, and multiple steel balls can be rotated. And a rotating chute having a steel ball discharge port above the circumference in which the steel ball receiver is arranged.

[0006]

When a rotating chute containing a plurality of steel balls is rotated at a high speed, the steel balls sequentially drop into a plurality of steel ball receivers below, and further through the distribution ports and distribution pipes below the steel ball disperser. Then, the soot dust that has been sprayed on the heat transfer surface of the heat exchanger and adhered is removed. At that time, some of the inlet opening areas of the plurality of steel ball receivers are larger than those of other steel ball receivers, so a larger number of steel balls enter the steel ball receiver with a larger opening area than the others. Sprayed from a specific steel ball disperser below. That is, since a large number of steel balls are scattered in a specific portion of the heat exchanger, soot dust adhering in a large amount is also removed. Then, when the steel ball receiver is rotated intermittently or continuously at a low speed, the position of the steel ball receiver with a large inlet opening area is moved sequentially, and along with this, many steel balls are sprayed intensively. Since the parts of the heat exchanger to be transferred are also sequentially moved, it is possible to effectively remove a large amount of soot and dust adhering to the entire heat exchanger.

[0007]

1 is a perspective view showing an embodiment of the present invention, FIG.
Is also a vertical sectional view. FIG. 3 is a view similarly showing the portions of the steel ball receiver and the distribution port developed in the circumferential direction.

In the figure, (1) is a plurality of steel ball distribution ports which are arranged along the circumference of a circle in a horizontal plane and have the same opening area on the upper surface. ), And the lower end is a distribution pipe reaching the steel ball disperser above the heat exchanger, and (3a) and (3b) are the same distribution along the circumference of the circle close to above the distribution port (1). It is a steel ball receiver which is arranged in the same number as the mouths and fixed to the inner wall of the lower end of the inner cylinder (4) and which can be rotated at a low speed around a vertical axis passing through the center of the circle.

Part of this steel ball receiver (3a)
Has a larger inlet opening area on the upper surface than the others (3b). The outlet opening areas on the lower surface are all equal.

(5) is the steel ball receiver (3a), (3b)
Of the steel ball receiver (3a), which is arranged above the vertical axis and is capable of high-speed rotation around the vertical axis and accommodates a plurality of steel balls.
(3b) is a rotary chute having a steel ball discharge port (5a) above the circumference where it is arranged. In addition, (6) is a drive device for the rotary chute (5), (7) is a steel ball receiver (3a), (3)
b) (Inner cylinder (4)) drive device. Further, (8) is a steel ball charging port.

When the rotating chute (5) is rotated at a high speed by the driving device (6) and the steel balls are supplied from the upper steel ball charging port (8), the steel balls are lowered into a plurality of steel ball receivers (3a),
Sequentially falling to (3b), further through the steel ball distribution port (1) and distribution pipe (2) therebelow to reach the steel ball disperser, which is scattered on the heat transfer surface of the heat exchanger and adhered to the dust. To remove.

At this time, since the rotating chute (5) rotates at a high speed, the steel balls are distributed to each steel ball distribution port (1) in a very short cycle. Therefore, the result is equivalent to the case of uniformly and continuously distributing to all the steel ball distribution ports (1) in a pseudo manner.

Some of the plurality of steel ball receivers (3
In (a), since the inlet opening area of the upper surface is larger than that of the other (3b), the steel ball receiver (3a) having a larger opening area contains a larger number of steel balls than the other (3b) The spheres are sprinkled from a particular steel ball disperser below. That is, since a large number of steel balls are scattered in a specific portion of the heat exchanger, soot and dust adhering in large quantities can be effectively removed. Then, the steel ball receivers (3a), (3b) are driven by the drive device (7).
When the steel is rotated intermittently or continuously at a low speed together with the inner cylinder (4), the position of the steel ball receiver (3a) having a large inlet opening area is sequentially moved, and along with this, a large number of steel balls are concentrated. Since the part of the heat exchanger that is sprayed to the heat exchanger also moves sequentially, steel balls are sprayed to each heat transfer tube group periodically for a certain period of time. FIG. 4 is a diagram illustrating a load pattern of the amount of steel balls in this case.

As described above, a large amount of soot dust can be effectively removed over the entire heat exchanger. Therefore, even in the case of a heat exchanger installed in an atmosphere where the dust concentration in the gas is high on the upstream side of the electrostatic precipitator in flue gas treatment equipment, etc. Can be prevented from falling. In addition, there has been a problem that the amount of steel ball circulation increases due to continuous spraying over the entire heat transfer tube group, the amount of wear on the equipment of the steel ball circulation line increases, and the cost also increases. If
Since the amount of continuous spraying is kept to a minimum and the amount of steel balls is periodically increased for a certain period of time, the heat transfer performance is restored and the amount of steel ball circulation is suppressed while maintaining stable heat transfer performance for a long period of time. be able to.

[0015]

According to the present invention, even if the dust concentration is high, it is possible to effectively spread the steel balls and maintain the stable performance of the heat exchanger. Therefore, a device that is reliable over a long period of time and that uses less steel balls is realized.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the above embodiment.

FIG. 3 is a diagram showing a steel ball receiver and a distribution port in the above embodiment, which are developed in the circumferential direction.

FIG. 4 is a diagram illustrating a load pattern of the amount of steel balls in the above embodiment.

FIG. 5 is a conceptual diagram showing an example of a heat exchanger incorporating a steel ball spraying type dust remover.

FIG. 6 is a perspective view showing an example of a conventional steel ball distributor.

[Explanation of symbols]

 (01), (1) Steel ball distribution port (02), (2) Distribution pipes (3a), (3b) Steel ball receiver (4) Inner cylinder (05), (5) Rotating chute (5a) Steel ball release Outlet (06), (6), (7) Drive device (08), (8) Steel ball inlet (11) Main body casing (12) Heat transfer tube group (13) Steel ball distributor (14) Steel ball disperser (15) Rotary separator (16) Steel ball transporter

Claims (1)

[Claims] 1. A steel ball distributor of a steel ball spraying type dust remover for removing soot and dust adhering to a heat transfer surface of a heat exchanger, wherein the steel ball distributor is arranged along a circumference of a circle in a horizontal plane and has an opening area of an upper surface. A plurality of equal distribution ports, the upper end of which communicates with each of the plurality of distribution ports, the lower end of which extends to the steel ball disperser above the heat exchanger, and the circumference of a circle close to the distribution port. Along the same number as the distribution ports, it can rotate at a low speed around a vertical axis passing through the center of the circle, and some of the upper surface inlet opening areas are larger than others and all the lower surface outlet opening areas are Equal steel ball receivers and steel ball receivers arranged above the steel ball receivers, capable of high-speed rotation about the vertical axis and accommodating a plurality of steel balls, and steels above the circumference where the steel ball receivers are arranged. A steel ball distributor comprising a rotating chute having a ball discharge port.