JPH0429264Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a heat exchanger in which a cylindrical soot blower is vertically disposed in the center of a plurality of spiral heat exchanger tubes.

The structure of a conventional heat exchanger is as shown in FIG. The heat exchanger tubes 3 are arranged horizontally and in parallel, the U-bend tubes 3b are connected to the folded ends of the heat exchanger tubes 3, the heat exchanger tubes 3 are fixedly held by the heat exchanger tube fixing plate 6, and the heat exchanger tubes 3 are At the inlet and outlet, the fluid to be heated is collected at headers 5a and 5b, and is fed to a predetermined location.

In addition, if the exhaust fluid contains dust, soot, etc., a rotary soot blower 4 is installed horizontally at a predetermined position in the three groups of heat exchanger tubes arranged horizontally and in parallel. Inspection port 7 for blowing away adhering soot by supplying soot blowing fluid and checking the state of adhesion of soot
was installed at a predetermined position on the outer edge of the box-shaped casing 2, and the rotary soot blower 4 was rotated while checking the dirt status of the heat transfer tube 3 to recover heat.

Furthermore, in the conventional heat exchanger 1, since the heat transfer tubes 3 are closely installed, dust, soot, etc. cannot be removed sufficiently.Therefore, heat recovery is stopped, cleaning is done by washing with water etc. through the inspection port 7, and then the heat exchanger is re-installed. The heat exchange structure requires a lot of effort such as heat recovery, and the U-bent tube 3b is connected to the folded part of the end of the heat exchanger tube 3, and the heat exchanger tube 3 is fixed and held by the heat exchanger tube fixing plate 6. It has the drawbacks of being complicated, large in size, heavy and expensive.

The present invention was devised in order to eliminate the above-mentioned drawbacks, and is designed to be small and lightweight, prevent soot from adhering to it, improve the heat exchange rate, and be provided at a low cost.

An example of implementing the present invention will be explained with drawings.
2, 3, and 4 show the cylindrical heat exchanger of the present invention, and the structure of the soot blower 12 will be explained as follows.
As shown in FIGS. 2 and 4, a soot blowing hole 12b is formed in the pipe wall of a cylinder 12b having a predetermined diameter and a required length.
1 at an appropriate position, a circular upper closing plate 12a is sealed to the upper part of the cylinder 12b, the lower part has a substantially inverted conical shape having the same shape as the cylinder 12b, and one end of the lower part is connected to a circular lower part. While connecting the lower receiver 12c formed by sealing with the closing plate 12c1, the lower receiver 1
The soot blower 12 is formed by continuously connecting the soot blower fluid supply pipe 12d to a required position of the soot blower 2c.

Next, the configuration of the cylindrical casing 10 will be described. The upper part of a cylinder 10a has a required size to house a heat exchanger in which a cylindrical soot blower 12 is vertically disposed in the center of a plurality of spiral heat exchanger tubes 11. An upper support 10b formed by a circular upper plate 10b3 connected in communication with a short pipe 10b2 having a companion flange 10b1 having the same diameter as the exhaust pipe outlet (not shown) is mounted and fixed thereon, and an exhaust pipe inlet (not shown) is mounted on the lower part. short cylinder 10c2 and cylinder 1 provided with a companion flange 10c1 having the same diameter as (omitted)
0a and an approximately inverted conical cylinder 10c3 having the same diameter to form a lower support 10c, and the lower surface of the cylinder 10a and the upper surface of the lower support 10c are welded and fixed to form a cylindrical casing 10. Headers 5a and 5b are provided at the required upper and lower portions of the pipe wall.

The cylindrical heat exchanger is assembled by arranging a plurality of spiral heat exchanger tubes 11 around the outer periphery of the soot blower 12, and covering the outer periphery with a cylindrical casing 10 covered with a heat insulating material 8. The eleven entrances and exits are connected to headers 5a and 5b, respectively.

In addition, a soot blower fluid transmission pipe 12d is passed through a through hole 12d' at a required position in the lower part of the cylindrical casing 10, and is connected to the lower part of the soot blower 12. The type heat exchanger tube 11 is vertically fixed.

The action of the soot blower is as shown in FIGS. 2 and 4. When the soot blower fluid E is pumped as shown by the arrow E from the soot blower fluid transmission pipe 12d, the soot blower fluid E is transferred to the soot blower 12. The soot and dust flowing out from the soot blowing hole 12b1 on the side wall of the cylinder 12b and adhering to the heat transfer tube 3 in the exhaust fluid are blown away and the exhaust pipe outlet companion flange 10b1 is removed.
The exhaust fluid is discharged from the outlet in the direction of arrow B.

The present invention is not limited to the present embodiment, and within the scope of the technical idea of the present invention, heat exchanger tubes are formed by spirally forming heat exchanger tubes of various shapes as shown in Fig. 5 A, B, C, D, E, and F. It can be used as a winding device, and can also be applied to heat exchangers using gaseous fluids containing dust other than exhaust fluid.

Because the cylindrical heat exchanger of the present invention has the above-mentioned configuration, compared to conventional heat exchangers, there is no U-bend part and all the spiral heat exchanger tubes serve as heat receiving parts, so it has better thermal efficiency and has a shorter length than conventional heat exchanger tubes. Compared to this, the length can be saved by about 20 to 30%, and since there is no bend, the structure is simple, and by winding it in a spiral, it is small and lightweight, making installation and installation easy.

In addition, by installing a soot blower vertically in the center of the spiral heat transfer tube, soot can be removed easily and easily, there is no need for a conventional inspection port to check for soot adhesion, and heat loss due to leakage of exhaust fluid, etc. is reduced. Therefore, it constitutes a heat exchanger with excellent thermal efficiency, and since the soot blower is a vertically fixed type, there is no failure at all, and it has remarkable effects such as being able to be provided at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing a conventional heat exchanger. FIG. 2 is a partially cutaway perspective view showing the circular heat exchanger of the present invention. FIG. 3 is a sectional view taken along line A-A showing the cylindrical heat exchanger of the present invention. FIG. 4 is a longitudinal sectional view showing the cylindrical heat exchanger of the present invention. Figure 5 A, B, C, D,
E and F are plan views showing heat transfer showing various shapes. 1... Heat exchanger (conventional), 2... Box-shaped casing, 2a... Exhaust pipe inlet companion flange, 3... Heat exchanger tube, 3b... U-bend pipe, 4... Rotary soot blower,
5... Header, 5a... Fluid inlet side header, 5b...
Fluid outlet header, 6...Heat transfer tube fixing plate, 7...Inspection port, 8...Insulating material, 9...Cylindrical heat exchanger, 10
...Cylindrical casing, 10a...Cylindrical, 11...
...Spiral heat exchanger tube, 12...Soot blower.

Claims (1)

[Scope of utility model registration request] A cylindrical soot blower is provided with a cylindrical casing having an exhaust fluid inlet at the lower end and an exhaust fluid outlet at the upper end, and inside the casing, the upper and lower ends are closed and a number of soot blowing holes are formed in the side wall. One or more rows of spirally wound heat transfer tubes are provided between the casing and the soot blower, and the inlet and outlet of the heat transfer tubes are located in the casing. A soot blowing fluid inlet provided in connection with a heated fluid inlet and a heated fluid outlet provided in the side wall, and furthermore, a soot blowing fluid inlet provided in the side wall of the casing communicates with the inside of the soot blower via a soot blowing fluid transmission pipe. A cylindrical heat exchanger characterized by being provided with a cylindrical heat exchanger.