JPS6311505Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a boiler or economizer that recovers the heat of exhaust gas, that is, exhaust gas discharged from a main engine such as a diesel engine or a gas turbine engine. The present invention also relates to an improvement of a steel ball dispersion device used as a device for removing soot from a heat transfer surface of an exhaust gas economizer or the like.

For example, as a soot removal device for an exhaust gas heat recovery boiler (hereinafter abbreviated as exhaust gas boiler) that utilizes the exhaust gas of a diesel main engine, steel balls of 4 to 6 φmm are traditionally sprayed from the top of the heat transfer surface of the exhaust gas boiler to remove the soot. A so-called steel ball dispersion device is employed, which effectively removes soot from the heat transfer surface.

The conventional steel ball dispersing device is shown in FIGS. 1 to 3.
As shown in the figure, a heat exchanger tube 2 is provided inside the exhaust gas economizer body 1, and a steel ball spreader 3 is disposed inside the exhaust gas economizer body 1 above the heat exchanger tube 2. The steel ball spreader 3 is a steel ball separator tank 4 provided outside the exhaust gas economizer main body 1.
and are connected via a steel ball shute pipe 5 and a steel ball distributor 6.

The exhaust gas economizer body 1 below the heat exchanger tubes 2 is provided with a lower hopper 8 and an exhaust gas introduction pipe 7 for guiding exhaust gas from the main engine.

A damper 9 for collecting steel balls is provided opposite to the lower end outlet of the lower hopper 8, and a chain conveyor box 10 having a chain conveyor disposed therein is attached in communication with the damper 9.
A shot intake nozzle 12 having a compressed air inlet 11 is attached to the outlet of the outlet. The outlet of the shot intake nozzle 12 is communicated with the steel ball separator tank 4 by connecting a steel ball transport pipe 13 therebetween.

Exhaust gas from the main engine is introduced into the exhaust gas economizer body 1 through the exhaust gas introduction pipe 7. The exhaust gas enters the exhaust gas economizer main body 1 and rises, and by heating the fluid flowing in the heat transfer tube 2, the heat of the exhaust gas is imparted to the fluid, and the temperature of the exhaust gas decreases.

The exhaust gas whose temperature has decreased is transferred from the upper outlet to the first
It is discharged as shown by the solid line arrow in the figure. Since the heat exchanger tubes 2 are exposed to exhaust gas, soot and dust adhere to the surfaces of the heat exchanger tubes 2. If soot and dust adhere, heat absorption from the exhaust gas in the heat exchanger tubes 2 decreases, so by scattering steel balls from the steel ball scatterer 3 and colliding with the heat exchanger tubes 2, the soot and dust attached to the surface of the heat exchanger tubes 2 is removed. do.

The steel balls fall through the exhaust gas economizer main body 1, accumulate in a lower hopper 8, and are sent from the lower end of the lower hopper 8 through an outlet damper 9 into a chain conveyor box 10.

The steel balls sent into the chain conveyor box 10 are sent by the chain conveyor to the shot intake nozzle 12 together with transport air that is pumped from the compressed air inlet 11, and further from the shot intake nozzle 12 to the steel ball transport pipe 13. The steel balls are sent to the steel ball separator tank 4 through the

Steel balls and air are separated in the steel ball separator tank 4, and the air is discharged from the steel ball separator tank 4, but the steel balls are stored in the steel ball separator tank 4. When dispersing steel balls, the lower end of the separate tank 4 is opened, and the steel balls are sent to the steel ball dispersion device 3 via the steel ball chute pipe 5 and the steel ball dispersion device 6.

By the way, during the above-mentioned dispersion of steel balls, the steel balls are scattered into the exhaust gas introduction pipe 7 due to collisions between the steel balls or the repulsion of the steel balls when they collide with the lower hopper 8, causing damage to the main engine and damage to the steel ball circulation. In order to prevent the deterioration of the soot and dust removal effect due to insufficient quantity, the lower hopper 8 has traditionally been equipped with a steel ball scattering prevention plate such as a block board 14 (Fig. 2) or a cap 15 (Figs. 1 and 3). Set up or
As shown in FIGS. 1 and 4, there is one in which a steel ball tray 16 is provided in the exhaust gas introduction pipe 7.

However, in these cases, for example, the second
In order to provide a steel ball scattering prevention plate such as a jamb board or an umbrella as shown in FIGS. 3 and 3, the lower hopper 8 must be enlarged, and the installation area of the exhaust gas boiler becomes large. Further, even if a steel ball receiving tray 16 as shown in FIG. 4 is provided, there are disadvantages such as not being able to sufficiently discharge the steel balls from the exhaust gas introduction pipe 7, and uneven flow of the exhaust gas resulting in uneven heat recovery of the exhaust gas. It was hot.

The present invention was made with the aim of eliminating the above-mentioned conventional drawbacks, and in an exhaust gas heat recovery boiler equipped with a steel ball dispersion soot removal device, the hopper for collecting steel balls that constitutes the lower foundation part of the boiler is improved. The feature is that an exhaust gas inlet pipe is provided that penetrates the side wall and opens downward at the center of the hopper, and a steel ball accumulation prevention umbrella is attached to the top surface of the exhaust gas inlet pipe. This prevents them from entering.

Next, the present invention will be explained based on the embodiment shown in FIGS. 5 and 6.

In the first embodiment shown in FIGS. 5a and 5b, the lower hopper 8 of the exhaust gas economizer main body is provided with an exhaust gas introduction pipe 7 that passes through its side wall and guides the exhaust gas from the main engine. This exhaust gas introduction pipe 7 is extended to the center of the lower hopper 8, and the end is connected to the lower hopper 8.
The exhaust gas outlet 17 is provided in a cylindrical shape and protrudes downward from the exhaust gas outlet 17, and the exhaust gas outlet 18 is disposed downward. Further, a steel ball drop hole 19 is provided at the lower butt portion of the end cylindrical protruding portion 17 of the exhaust gas introduction pipe 7 and the horizontal portion of the exhaust gas introduction pipe. Further, a steel ball deposition prevention umbrella 20 is attached to the upper surface of the exhaust gas introduction pipe 7 in the form of a roof.
In the figure, 21 is a steel ball.

In the second embodiment shown in FIGS. 6a and 6b, a part of the end of the exhaust gas introduction pipe 7 is cut out, and the exhaust gas outlet 18 is disposed there facing downward with respect to the lower hopper 8. This is similar to the first embodiment shown in FIG.

Note that the other structures in FIGS. 5 and 6 are the same as the conventional exhaust gas economizer shown in FIG. 1, so a description thereof will be omitted.

The steel balls stored in the steel ball separator tank 4 are
The steel balls are guided through the steel ball chute pipe 5 to the steel ball disperser 6, and further dispersed to the steel ball spreader 3, from which the steel balls are dispersed. When the steel balls are scattered and fall down the exhaust gas economizer body 1, they collide with the heat exchanger tubes 2 and brush off the soot and dust attached to the outer surface of the heat exchanger tubes 2. After that, the steel ball falls into the lower hopper 8 along with soot,
It collides with the inner wall, bounces off, and scatters. At the same time, the steel balls collide with each other and are scattered toward the exhaust gas inlet pipe 7, but in the present invention, the exhaust gas inlet pipe 7 is connected to the lower hopper 8.
By extending to the center of the steel ball 2 and locating the exhaust gas outlet 14 downward with respect to the lower hopper 8
1 will not scatter into the exhaust gas introduction pipe 7.
Furthermore, since the steel ball deposition prevention umbrella 20 is provided on the upper surface of the exhaust gas introduction pipe 7, steel balls will not be deposited on the upper part of the exhaust gas introduction pipe 7. Furthermore, even if a steel ball were to scatter into the exhaust gas introduction pipe 7, the steel ball would easily fall from the exhaust gas introduction pipe 7 into the lower hopper, since the steel ball drop hole 19 is provided downward in the exhaust gas introduction pipe 7. It will be collected on 8th.

The present invention is constructed as described above and operates based on this structure, so that the following effects are produced.

(1) The exhaust gas outlet is located in the center of the lower hopper, eliminating uneven flow of exhaust gas.

(2) Since the exhaust gas outlet is arranged downward with respect to the lower hopper, the steel balls will not be scattered directly into the exhaust gas introduction pipe, and the steel balls can be reliably recovered.

(3) A guard plate inside the lower hopper to prevent steel balls from scattering.
Since there is no need to install an umbrella or the like, the lower hopper can be simplified and the cost can therefore be reduced.

(4) Since the structure of the lower hopper can be arbitrarily selected according to (3) above, the installation area of the exhaust gas boiler can be small.

Although the present invention has been specifically explained above based on the above-mentioned embodiments, the present invention is not limited to the above-mentioned embodiments, and various changes can be made without departing from the gist of the present invention. .

[Brief explanation of the drawing]

Figure 1 is a schematic diagram of a conventional exhaust gas economizer.
Fig. 2 is an enlarged view of a conventional lower hopper, Fig. 3 is an enlarged view of another embodiment of the conventional lower hopper, Fig. 4 is an enlarged view of a conventional exhaust gas introduction pipe, and Fig. 5a is an enlarged view of the present invention. Schematic diagram of the lower hopper showing the first embodiment of the fifth embodiment.
Figure b is a view in the direction of the - arrow in Figure 5a, Figure 6a is a schematic view of the lower hopper showing the second embodiment of the present invention,
FIG. 6b is a view taken along the - arrow in FIG. 6a. 1...Exhaust gas economizer body, 2...Heat transfer tube, 3...Steel ball scatterer, 4...Steel ball separator tank, 5...Steel ball chute pipe, 6...Steel ball disperser, 7...Exhaust gas introduction Pipe, 8...Lower hopper, 9
...Dumper, 10...Chain conveyor box,
11...Compressed air inlet, 12...Shot intake nozzle, 13...Steel ball transport pipe, 14...
Jiyama board, 15... Umbrella, 16... Steel ball saucer, 1
7... Cylindrical protrusion, 18... Exhaust gas outlet, 19...
...Steel ball drop hole, 20...Steel ball accumulation prevention umbrella, 21...
…wrecking ball.

Claims (1)

[Scope of utility model registration request] In an exhaust gas heat recovery boiler equipped with a steel ball dispersion soot removal device, an exhaust gas introduction pipe is provided that penetrates the side wall of a hopper for steel ball recovery that constitutes the lower foundation of the boiler and opens downward in the center of the hopper. ,
An exhaust gas heat recovery boiler characterized by having a steel ball accumulation prevention umbrella attached to the top surface of the exhaust gas inlet pipe.