JPS5838317Y2 - Device for removing adhering dust inside the element tube of a heat exchanger - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for removing adhering dust within an element tube of an air preheater or other heat exchanger that utilizes exhaust gas from an incinerator.

In heat exchangers such as air preheaters and waste heat boilers that use the exhaust gas of an incinerator to generate hot air or hot water, there are many types of heat exchangers that circulate the exhaust gas from the incinerator through the inlet of cold air or cold water inside the vessel. An element tube is provided, and the heat of high-temperature exhaust gas passing through the element tube converts cold air or water passing outside the element tube into warm air or hot water.

In heat exchangers that use exhaust gas generated from such incinerators, the dust contained in the exhaust gas adheres to the inner surface of the element tube, so if this is not removed, it will become clogged and become unusable after long-term use. becomes.

For this reason, a soot blower type has conventionally been used as a means for removing the dust adhering within the element tube.

However, as shown in the system diagram of FIG. 5, this one-type soot blower requires a compressor, a service tank, a steam system, various piping equipment, and other soot blower equipment in addition to the heat exchanger.

As a result, the entire equipment is very complex and the equipment costs are high, the capacity of the service tank is quite large and a correspondingly large installation area is required, and since a high-pressure compressor is used, maintenance management is troublesome.

In view of the above, the present invention was devised to provide a device for removing adhering dust inside an element tube, which has a simple structure, can be installed at low cost, and can be easily maintained and inspected. The suspended chain is rotated and at the same time moves up and down.

Next, embodiments of the present invention will be described based on the drawings.

1 is a low medium inflow chamber for cold air, cold water, etc. separated by upper and lower partition plates 2 and 3 inside the heat exchanger; 4 is the low medium inflow chamber 1;
These are a plurality of element tubes that penetrate almost perpendicularly through the partition plates 2 and 3 and are open at the top and bottom of the partition plates 2 and 3. Exhaust gas discharged from the incinerator and serving as a heat transfer medium flows through the element tubes 4 from below to above.

A large number of element tubes 4 are provided depending on the capacity of the heat exchanger.

Reference numeral 5 denotes a ring-shaped cam that changes in height in the vertical direction, and is supported by a cam receiver 7 hanging vertically from the main body 6 of the heat exchanger at a position above the element tube 4 so as to be concentric with the element tube 4. and horizontally.

This ring-shaped cam 5 has at least two high parts 5a formed on its upper surface as shown in the figure, and these are formed to have the same height at positions facing each other by 180 degrees around the ring axis. At the same time, remove the remaining parts from the lower part 5.
b.

A rod-shaped cam arm 8 is arranged in the diametrical direction of the ring-shaped cam 5, and both ends thereof are placed on the cam surface.

A chain 11 of a required length is connected to the rotation center of the cam arm 8 via a slide ring 9 and a connecting bar 10, and the chain 11 is inserted into the element tube 4 and suspended.

The base ring constituting the chain 11 is formed to have a width slightly smaller than the inner diameter of the element tube 4, and the total length of the chain is longer than the element tube.

The chain 11 is connected directly to the cam arm 8 without using the slide ring 9 etc.
It is also possible to install it perpendicularly from the center of rotation.

The cam arm 8 is engaged with the lower end of a rotary shaft 12 provided coaxially with the ring-shaped cam 5, and the rotary shaft 12 is connected to a drive source via a deceleration mechanism (not shown). The chain sprocket 13 to be connected is fixed,
As the rotating shaft 12 rotates, the cam arm 8 slides and rotates on the cam surface of the ring-shaped cam 5, and moves up and down according to the height of the cam 5.

In order to enable vertical movement of the cam arm 8, the lower part 12' of the rotating shaft 12 is made into a square shaft, and this is slidably fitted into the square hole 14 in the center of the cam arm 8, or the rotating shaft 1
2 is composed of a large-diameter shaft 12b and a small-diameter shaft 12a fitted to the large-diameter shaft 12b through spline fitting or a slide key, etc., so that the small-diameter shaft 12a can be rotated and axially slid relative to the large-diameter shaft 12b. The cam arm 8 is fixed to the lower part 12' of the small diameter shaft 12a.

Reference numeral 15 is a bearing for the rotating shaft 12 and is fixed to the main body 6.

The present invention is constructed as described above, and when the soot and dust in the exhaust gas adheres to the inner surface of the element tube 4, when the rotation is transmitted to the rotating shaft 12 and the cam arm 8 is rotated,
The cam arm 8 slides and rotates on the cam surface of the ring-shaped cam 5 and at the same time moves up and down according to the height of the cam 5. The chain 11 suspended from the cam arm 8 and inserted into the element tube 4 below is attached to the cam arm 8. The element tube 4 simultaneously rotates and moves up and down in conjunction with the rotation, and scrapes the inner surface of the element tube 4 to remove dust attached thereto.

In particular, if there is a sudden drop when transitioning from the high part 5a to the low part 5b of the ring-shaped cam 5, an impact is applied to the chain 11, and as a result, the chain 11 repeats rotation and vertical movement while vibrating. However, the dust removal effect on the inner surface of the element tube is even greater.

As described above, although the one-type soot blower does not have any remarkable removal effect, by using it from the initial stage of dust adhesion, it is possible to remove dust sufficiently without interfering with the heat exchange function. Since it is only necessary to give rotation to the soot blower, operating costs can be reduced compared to a soot blower type that uses a compressor, even if the blower is operated for a long time.

Moreover, the structure is simple and easy to manufacture, and the equipment cost is lower than that of a one-type soot blower.

In particular, chains can be purchased commercially at low cost, and as consumables, they are inexpensive and easy to replace.

Furthermore, since a simple chain and cam mechanism is used, maintenance and inspection are easy.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view showing an embodiment of the present invention, Fig. 2 is a partially enlarged sectional view, Fig. 3 is a sectional view taken along line III-III in the previous figure, and Fig. 4 is a system diagram of the device of the present invention. FIG. 5 is a system diagram of a conventional dust removal device using one type of soot blower. 4...Element tube, 5...Ring-shaped cam, 6...Main body of heat exchanger, 8...
...Cam arm, 11...Chain, 12...
···Axis of rotation.

Claims (1)

[Claim for Utility Model Registration] A device for removing adhering dust in element tubes in a heat exchanger, which includes: (1) a plurality of element tubes arranged almost vertically in the heat exchanger and into which a heat medium such as incinerator exhaust gas is introduced; , II. A ring-shaped cam provided above the element tube concentrically with the element tube and substantially horizontally, and III. At least two locations on the upper surface of the ring-shaped cam facing 180° are high and the remaining locations are high. IV. A rod-shaped cam arm arranged in the radial direction of the cam ring and having both ends placed on the cam surface, and It is characterized by comprising: a chain vertically disposed within the element tube via a Vl; and a drive means for rotating the cam arm, and by rotating the cam arm, rotation and vertical movement are imparted to the chain. A device for removing adhering dust inside the element tube of a heat exchanger.