JP3471703B2 - Heat exchange equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchange device for recovering sensible heat of a high temperature gas into a low temperature gas by using a granular heat medium.

[0002]

2. Description of the Related Art A sensible heat is recovered from a high temperature gas such as exhaust gas by using a granular heat medium having a diameter of about 1 to 3 mm, and a heat exchange device for heating a low temperature gas such as room temperature air with the recovered sensible heat. An example is that disclosed in Japanese Patent Laid-Open No. 54-139160.

As shown in FIG. 4, this heat exchange device includes an upper heat exchange chamber 42 in which a high temperature gas 41 flows, and a low temperature gas 4
3 are arranged above and below a lower heat exchange chamber 44, and these heat exchange chambers 42, 44 are communicated with each other by a communication section 45 having a small cross section, and trays 46, 4 are respectively provided in the heat exchange chambers 42, 44.
7 are provided in multiple stages. The granular heat medium 48 is charged through a charging port 49 provided in the upper heat exchange chamber 42,
In the lower heat exchange chamber 44, the sensible heat recovered from the high-temperature gas 41 in the upper heat exchange chamber 42 is sequentially dropped to the trays 46 of the upper heat exchange chamber 42, the communication portion 45, and the trays 47 of the lower heat exchange chamber 44. The low temperature gas 43 is discharged to heat the low temperature gas 43. The heat medium 48 that has dropped to the bottom of the lower heat exchange chamber 44 is taken out from the discharge port 50 provided at the bottom, returned to the input port 49 of the upper heat exchange chamber 42 through the transport path 51, and is circulated for use. .

[0004]

When a heat exchange device of the type described above is operated for a long period of time, the refractory used for the inner wall of the heat exchange chamber may be damaged, and a part of it may peel off and fall into the room. . Further, when combustion exhaust gas is used as a high temperature gas as a heat source, the heat medium may be aggregated by the adhering substances such as tar and chloride contained in the exhaust gas.

Since these peeled substances and agglomerates not only hinder the smooth circulation of the heat medium but also are heavy and have poor fluidity, they remain on the tray and hinder the flow of the gas to be heat exchanged. There is. In addition, the aggregated heat medium has a small surface area ratio, which reduces heat exchange efficiency.

[0006] Therefore, an object of the present invention is to provide a heat exchange device capable of removing exfoliated matters and aggregates in the heat exchange chamber.

[0007]

In order to solve the above-mentioned problems, the present invention has an upper heat exchange chamber through which a high temperature gas flows and a lower heat exchange chamber through which a low temperature gas flows, which are provided above and below. The lower part of the heat exchange chamber and the upper part of the lower heat exchange chamber are communicated with each other through a communication section having a small cross section, trays are arranged in a plurality of stages in each heat exchange chamber, and from the heat medium inlet provided in the upper heat exchange chamber. The heat medium to be charged is sequentially dropped onto each tray of the upper heat exchange chamber, the communicating portion, each tray of the lower heat exchange chamber, and the bottom of the lower heat exchange chamber, and a gas flowing through each of the heat exchange chambers. In a heat exchange device for heat exchange, the high temperature gas is high temperature exhaust gas generated when waste is treated,
At least one of the trays of the lower heat exchange chamber is formed of a perforated plate which covers the cross section of the lower heat exchange chamber in which the tray is arranged and is provided with a large number of through holes. Also has one or more large diameter discharge holes.
The edge is formed so that it protrudes slightly above the upper surface of the tray.
Then, connect the discharge pipe to the lower side, pipe this discharge pipe downward, guide the tip to the outside of the lower heat exchange chamber, and connect the branch pipe of the low temperature gas in the middle of this discharge pipe.
Then, a structure was adopted in which the low temperature gas was jetted upward into the discharge pipe.

That is, the lower heat exchange formed by the perforated plate
At least one tray in the chamber is provided with a discharge hole having a diameter larger than a large number of through holes through which the heat medium passes, and the debris and the agglomerates are dropped into this discharge hole, and the discharge pipe removes it outside the heat exchange chamber. The light, non-agglomerated heat medium that drops into the discharge holes is blown back up into the heat exchange chamber by the upwardly ejected gas. Note that high-temperature gas is an adhesive property such as tar and chloride that is generated when waste such as general waste and industrial waste is incinerated in an incinerator, melted in a melting furnace, or decomposed in a thermal decomposition furnace. It is a high-temperature exhaust gas containing substances.

A collection container is arranged at the tip of the discharge pipe, a screen for partitioning the container into upper and lower parts is provided in the collection container, and means for sieving the fallen substances from the discharge pipe with this screen is provided. The aggregated heat medium can be separated with a sieve and collected under the screen. As means for sieving, a method of stirring the inside of the collection container,
A method of vibrating the collection container or the like can be adopted.

Means is provided for returning the heat medium that has dropped to the bottom of the lower heat exchange chamber to the inlet of the upper heat exchange chamber through an external transfer path, and the heat medium screened by the screen is transferred to the external transfer path. By feeding the heat medium, the heat medium can be effectively used.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. This heat exchange device is shown in FIG.
As shown in, the upper heat exchange chamber 2 through which the high temperature gas 1 flows
And a lower heat exchange chamber 4 through which the low-temperature gas 3 flows is arranged above and below, and these heat exchange chambers 2 and 4 are connected by a communication pipe (communication part) 5, and each of the heat exchange chambers 2 and 4 has a large number. The trays 7 and 8 having the through holes 6 are provided in a plurality of stages. The granular heat medium 9 is introduced through an inlet 10 provided in the upper part of the upper heat exchange chamber 2, and the trays 7 in the upper heat exchange chamber 2 are
The communication pipe 5, each tray 8 of the lower heat exchange chamber 4, and the bottom of the lower heat exchange chamber 4 are sequentially dropped, and the upper heat exchange chamber 2 is vented to the ventilation port 11.
Sensible heat is recovered by contact with the high temperature gas 1 flowing from the exhaust port 12 to the exhaust port 12, and the lower heat exchange chamber 4 is ventilated from the vent port 13 to the exhaust port 14.
The sensible heat collected is released to the low temperature gas 3 flowing to the low temperature gas 3 to heat the low temperature gas 3.

The trays 7 in the upper heat exchange chamber 2 are mounted so as to be inclined, and the heat medium 9 is passed through the end of the tray 7 and the through hole 6 while the heat medium 9 is flowing by the high temperature gas 1, and the tray 7 on the lower stage side. To the lower heat exchange chamber 4 through the communication pipe 5 having a small cross section.

The trays 8 of the lower heat exchange chamber 4 are horizontally attached so as to cover the cross section of the lower heat exchange chamber 4,
The heat medium 9 that has entered the lower heat exchange chamber 4 flows through the through holes 6 and drops to the lower stage side while being flown by the low-temperature gas 3, and accumulates at the bottom of the lower heat exchange chamber 4. Each tray 8 is a vibration device 1
Vibration is applied at 5 to prevent the heat medium 9 from adhering to the tray 8.

The heat medium 9 accumulated at the bottom of the lower heat exchange chamber 4 enters the ejector 17 from the discharge port 16 provided at the bottom of the lower heat exchange chamber 4, and is carried by the air blown by the blower 18. It is returned to the hopper 20 through the pipe 19, and is again charged into the upper heat exchange chamber 2 from the charging port 10.

Each tray 8 of the lower heat exchange chamber 4 is provided with a discharge hole 21 formed of a ring having a diameter larger than that of the through hole 6, and as shown in FIG.
A discharge pipe 22 is connected to the lower side of the discharge hole 21.
In the middle of the discharge pipe 22, the low temperature gas 3 is discharged from the discharge pipe 2
A branch pipe 23 that is jetted upward into the inside 2 is connected, and the tip of the discharge pipe 22 is guided to a recovery container 24. The exfoliated substances such as refractory and the agglomerates of the heat medium 9 which are larger than the through holes 6 generated in the heat exchange chambers 2 and 4 pass through the discharge holes 21 and the discharge pipe 2 respectively.
2 and falls in the collection container 24. Discharge pipe 22
Although the single heat medium 9 also falls into the inside, the light single heat medium 9 is blown up by the low temperature gas 3 ejected from the branch pipe 23 and returned into the lower heat exchange chamber 4. In addition, each discharge hole 21
The hole edge is formed so as to slightly project from the upper surface of the tray 8 so as to reduce the drop of the single heat medium 9 into the discharge hole 21.

The recovery container 24 is vibrated by a vibration device 25 and is connected to the discharge pipe 22 via a vibration absorption damper 26. The inside of the collection container 24 is vertically divided by a screen 27, and the exfoliated substances and aggregates that have fallen into the collection container 24 are sieved by this screen 27. The heat medium 9 which has been separated into a single substance by the vibration of the vibrating device 25 and dropped below the screen 27 is sent to the ejector 17 from the discharge port 28 provided at the bottom of the recovery container 24 and discharged from the lower heat exchange chamber 4. It is returned to the hopper 20 together with the heat medium 9 sent from the outlet 16. On the other hand, exfoliated matters and aggregates remaining on the screen 27 are removed from the recovery container 24 when the heat exchange device is stopped.

FIG. 3 shows a modification of the recovery container 24. The recovery container 29 is directly connected to the discharge pipe 22, and a rotary blade 32 driven by a motor 31 is attached to the upper side of the screen 30. The exfoliated substances and aggregates that have fallen into the recovery container 29 are agitated by the rotary blades 32, and the heat medium 9 that has been separated as a single substance falls under the screen 30 and is sent to the ejector 17 from the discharge port 33.

[0018] In the above embodiment, the bottom of the tray ejection hole of the lower heat exchange chamber has been connected to the discharge pipe for discharging the peeled product or aggregates, in addition to the tray of the lower part heat exchange chamber, the discharge It is also possible to provide a discharge hole connected to the pipe.

[0019]

As described above, in the heat exchange device of the present invention, at least one of the trays of the lower heat exchange chamber is a perforated plate which covers the transverse section of the heat exchange chamber and is provided with a large number of through holes. This exhaust pipe is formed by forming one or more discharge holes having a diameter larger than the through hole in this perforated plate, connecting a discharge pipe to the lower side of this discharge hole, and guiding the tip to the outside of the heat exchange chamber. Since the gas was ejected upward during the process, heavy exfoliated substances and agglomerates can be dropped into the discharge hole and discharged to the outside of the heat exchange chamber through the discharge pipe, and a light unit heat medium that drops into the discharge hole. Can be returned to the heat exchange chamber by the gas ejected upward.

Further, a collection container is arranged at the tip of the discharge pipe, a screen for partitioning the container into upper and lower parts is provided in the collection container, and a means for sieving the falling matter from the discharge pipe with this screen is provided. As a result, the aggregated heat medium can be separated with a sieve and collected under the screen.

Further, the heat medium screened by the screen is sent to the external transfer path and returned to the upper heat exchange chamber, whereby the heat medium can be effectively utilized.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional front view showing an embodiment of a heat exchange device.

FIG. 2 is a longitudinal sectional view showing an enlarged main part of FIG.

FIG. 3 is a vertical cross-sectional view showing a modified example of the collection container in FIG.

FIG. 4 is a schematic vertical sectional front view showing a conventional heat exchange device.

[Explanation of symbols]

1 high temperature gas 2 heat exchange room 3 low temperature gas 4 heat exchange room 5 communication pipe 6 through holes 7, 8 trays 9 heat medium 10 slot 11 vents 12 exhaust port 13 Vent 14 exhaust port 15 Vibration device 16 outlet 17 ejector 18 Blower 19 carrier pipe 20 hoppers 21 Discharge hole 22 Discharge pipe 23 Branch pipe 24 Collection container 25 Vibration device 26 damper 27 screen 28 outlet 29 Collection container 30 screen 31 motor 32 rotating blades 33 outlet

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Nagano 1-12-19 Kitahori, Nishi-ku, Osaka City Kurimoto Iron Works Co., Ltd. (72) Inventor Ikuro Yabuki 1-4-1 Yurakucho, Chiyoda-ku, Tokyo Machinery Co., Ltd. (72) Inventor Keiji Kishii 1-1-1, Sonoyama, Otsu, Shiga Toray Engineering Co., Ltd. (72) Shinji Asada 4- 1-3, Kutaro-cho, Chuo-ku, Osaka Unitika Corporation (56) References JP-A-11-63868 (JP, A) JP-A-58-213187 (JP, A) JP-A-57-10002 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F28D 19/02 F23G 5/46 F28D 13/00 F28C 3/10 F23J 1/00

Claims (3)

(57) [Claims] 1. An upper heat exchange chamber through which a high temperature gas flows and a lower heat exchange chamber through which a low temperature gas flows are provided above and below, and the lower part of the upper heat exchange chamber and the upper part of the lower heat exchange chamber communicate with each other with a small cross section. Of the upper heat exchange chamber, the trays are arranged in a plurality of stages in each heat exchange chamber, and the heat medium introduced from the heat medium inlet provided in the upper heat exchange chamber is communicated with each tray of the upper heat exchange chamber. Part, each tray of the lower heat exchange chamber, and the heat exchange device that sequentially drops the heat to the bottom of the lower heat exchange chamber to exchange heat with the gas flowing through each heat exchange chamber, and the high-temperature gas processed waste. a high temperature exhaust gas generated when the lower heat
At least one of the trays of the exchange chamber is formed by a perforated plate which covers the transverse section of the lower heat exchange chamber in which the tray is arranged and is provided with a large number of through holes, and the perforated plate is larger than the through holes. One or more diameter discharge holes are provided, and the edge of this discharge hole is
The recording tray is formed so that it protrudes slightly above the top surface of the tray.
The discharge pipe is connected to the lower side, the discharge pipe is piped downward, the tip is led out to the outside of the lower heat exchange chamber, and the branch pipe of the low temperature gas is connected in the middle of the discharge pipe. ,
A heat exchange device characterized in that a low temperature gas is ejected upward into an exhaust pipe. 2. A collection container is arranged at the tip of the discharge pipe,
The heat exchange device according to claim 1, wherein a screen for partitioning the container into upper and lower parts is provided in the recovery container, and a means for sieving the falling matter from the discharge pipe with the screen is provided. 3. A means for returning the heat medium that has fallen to the bottom of the lower heat exchange chamber to the inlet of the upper heat exchange chamber through an external transportation path, and the heat medium screened by the screen is externally transported. The heat exchange device according to claim 2, wherein the heat exchange device is fed into the path.