JPS5828519B2 - Heat exchanger for waste heat recovery - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an exhaust heat recovery heat exchanger with high heat recovery efficiency.

Slag discharged from blast furnaces, etc. is atomized by blowing high-pressure air onto the molten material, and cold air is applied to the atomized slag to remove heat from the atomized slag. There is a method of recovering heat.

In this way, heat is recovered, but in order to recover efficiently, it is necessary to allow a lot of contact time with the slag, and conversely, if the residence time of the slag is too long, the slag will become too cold and heat recovery will not be possible. This results in an unfavorable situation for

However, conventional heat exchange equipment is known to be a rotary heat exchanger or one that simply blows a headwind against the slag to recover heat, but in the former case, the equipment itself is large and
Moreover, the latter requires a rotation function, and the latter has poor heat recovery effect, so both have disadvantages that cannot be called economical.

The present invention was made in view of the above-mentioned problems of the conventional example. For example, slag at about 1500°C fed in at 100 T/H is heated with hot air at 600 to 700°C with a cold air flow rate of 98.00 ONm'/H (200C). In order to obtain this, it is necessary for the slag to stay for about 2 minutes or more, and it is also necessary for the slag to be evenly exposed to cold air. Therefore, in the present invention, so that the slag is evenly exposed to cold air,
In addition, baffle plates are provided in multiple stages to allow the slag to fall appropriately, and the slag is allowed to fall naturally from the top, and cold air is sent in a countercurrent state from the bottom to prevent clogging of the upper baffle plate. It is characterized by

Next, preferred embodiments of the exhaust heat recovery heat exchanger according to the present invention will be described in detail with reference to the accompanying drawings.

Fig. 1 is a sectional view of the first embodiment of the present invention, and Fig. 2 is its A.
-A sectional view, FIG. 3 is a perspective view of section B in FIG. 1, FIG. 4 is a second embodiment of the present invention, and FIG. 5 is a perspective view of section 0 in FIG. 4.

First, to explain the first embodiment, the heat exchanger main body 1 is as follows:
The granular slag is received through the input port 2 as indicated by the D arrow, and the slag is evenly dispersed by the distribution skirt 3.

The scattered slag is further scattered by a baffle plate 4 having a large number of holes 5 through which the hopper-shaped slag can sufficiently pass, and some of the slag passes through a support 6 which also has holes 7 through which the slag can sufficiently pass.

The slag thus dispersed is collected again by the armor-like bottom plate 8 and discharged in the E direction through the slag discharge port 9.

Furthermore, in order to sufficiently support the heat exchanger main body 1, it is also possible to provide a support column 12 at the bottom of the column 6.

Reference numeral 13 denotes a charge air pocket which allows the air sent in from the nozzle 10 as shown by arrow G to circulate, and has the function of evenly raising the air.

This air exchanges heat with the dispersed slag in a countercurrent relationship and is taken out from the exhaust pipe 11.

The second embodiment differs from the first embodiment in that the baffle plates 4' are arranged in a lattice pattern as shown in FIG.

A blower (not shown) takes in cold air from a nozzle 10', and the cold air passes through a baffle plate 4' and a distribution skirt exhaust port 16, and further passes through a dust collection device 17 such as slab wool, and is collected in a chamber 14, and then sent from an absorption pipe 15 to a predetermined amount. In both of the above-mentioned embodiments, the exhaust heat can be recovered by sucking or pumping cold air, but as a more suitable method, the first embodiment uses air pressure feeding, and the second embodiment uses air suction. Set as .

The granulated slag is distributed to the uppermost baffle plate 4 by the distribution skirt 3.

Then, a part of it falls through the hole 5 to the lower baffle plate, and a part of it falls to the support column 6.

In this way, the slag gradually disperses and falls.

At this time, the pressurized air rises evenly against the falling slag to the bottom plate 8, absorbs heat from the slag, and is collected at the exhaust pipe 11, but since the air flows opposite the slag,
, 7. It also prevents slag clogging.

In this way, almost all the slag comes into contact with the cold air and is collected through the bottom plate 8 and the outlet 9 to a predetermined location.

In the second embodiment, the cold air sucked through the nozzle 10' by a suction device such as a blower connected to the suction pipe 15 flows evenly from the bottom plate 8' and rises through the hole 5' of the baffle plate 4'.

and partly along the body 1' and partly along the distribution skirt 3.
The heat collected and taken away from the chamber 14 is conveyed to a predetermined device through the exhaust port 16 of ' and further through the dust collection device 17 such as slag wool.

The other operations are the same as in the case of the above-mentioned Embodiment ①.

According to the exhaust heat synchronizing heat exchanger of the present invention, slag particles can be dispersed simply by providing a baffle plate and a distribution skirt, the heat recovery efficiency is increased, and there is an advantage that a drive mechanism for the heat exchanger body is not required from the side. be.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a first embodiment of the present invention, FIG. 2 is a sectional view taken along line A-A in FIG. 1, FIG. 3 is a perspective view of section B in FIG. 1, and FIG. 5 is a sectional view showing a second embodiment of the present invention, and FIG. 5 is a perspective view of section C in FIG. 4. 1.1'...Heat exchanger body, 2...Inlet, 3゜3'...Distribution skirt, 4,4'.
...Baffle plate, 5, 5'...Hole, 6...
...Strut, 7...Hole, 8, 8'...
Bottom plate, 9...Discharge port, i o, i o'・
... Air intake nozzle, 11 ... Exhaust pipe,
12...Support column, 13...Charge air pocket, 14...Chamber 15...
...Suction pipe, 16...Distribution skirt exhaust port, 1
γ...Dust collection device.

Claims (1)

[Claims] 1. A distribution skirt is provided at the top, which has a ventilation and slag passageway at the top and allows the high-temperature granular slag transported from outside the heat exchanger to be dispersed and dropped, and holes large enough to allow the slag to pass through are formed over the entire surface, and from the distribution skirt. A multi-stage perforated baffle plate is arranged to receive and further disperse the slag, and the cold air is raised from the bottom as a counterflow against the falling slag, thereby exchanging heat over the entire surface of the multi-stage baffle plate. A vertical counterflow type heat exchanger for exhaust heat recovery, characterized in that the heat exchanger performs the following.