JP3032695B2 - Dust collection heat exchanger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust collecting heat exchanger having both a dust collecting function and a heat exchanging function used for treating high-temperature exhaust gas containing dust generated from an incinerator such as sludge or industrial waste.

[0002]

2. Description of the Related Art Conventionally, in a sludge incineration plant, for example, as shown in FIG. 3, (A) combustion exhaust gas generated when drying and incinerating dehydrated sludge at a temperature of about 800 ° C. in a fluidized incinerator is incinerated. Discharged with ash. This high-temperature exhaust gas undergoes heat exchange in the heat exchanger (B),
(C) Relatively coarse dust such as incineration ash is separated and collected in a cyclone, and (D) fine dust is removed by an electric dust collector. Then, (E) harmful gas components and the like are removed in a flue gas treatment tower. After removal, it is released into the atmosphere. The above-mentioned heat exchanger is incorporated for exchanging heat with combustion air, sludge drying air or white smoke prevention air with high-temperature exhaust gas to preheat the heat, and supply it to a required portion.

As described above, a heat exchanger and a dust collector such as a cyclone are indispensable equipments for treating high-temperature exhaust gas containing dust, and separate devices have been used separately. However, in recent years, in addition to the increase in the amount of sewerage sludge, the demand for pollution-free treatment of industrial waste and general household waste has increased, but it has become difficult to secure a sufficient area for such treatment sites. Research for minimizing the installation area of each processing apparatus is being actively pursued.

[0004]

SUMMARY OF THE INVENTION The present invention has been completed as a part of the above-mentioned research, and it is an object of the present invention to minimize the installation area between a dust collector for treating high-temperature exhaust gas containing dust and a heat exchanger. To provide a dust collecting heat exchanger that enables

[0005]

SUMMARY OF THE INVENTION The above problem is caused by the provision of an inlet for introducing high-temperature exhaust gas containing dust at the upper part, a conical lower part, and an opening / closing opening at the lowermost part. And the central upper part in the cylindrical casing
And an exhaust gas outlet pipe for extracting exhaust gas after heat transfer, which is disposed to be opened downward at the lower center.
Between the inner wall of the cylindrical casing and the exhaust gas outlet pipe
The problem is solved by a dust collector heat exchanger characterized by comprising a plurality of heat transfer tubes for conducting heat transfer gas disposed in the longitudinal direction in a downward flow space of exhaust gas located therein. be able to. Further, by providing the introduction port for introducing high-temperature exhaust gas containing dust along the tangential direction of the cylindrical casing, the introduction direction of the high-temperature exhaust gas is provided,
It can be further embodied.

[0006]

According to the present invention, by adopting the above structure, the high-temperature exhaust gas including dust guided into the cylindrical casing from the inlet provided at the upper part of the cylindrical casing can be removed from the lower central portion of the cylindrical casing. Dust having a large specific gravity falls downward while flowing toward the outlet disposed in the cylindrical casing, and accumulates in a conically formed portion below the cylindrical casing. On the other hand, inside the cylindrical casing , the inner wall and the
In the downward flow space of exhaust gas located between the exhaust gas outlet pipe
Oite, because many longitudinal direction is of heat exchanger tubes of that is arranged, while the high temperature exhaust gas as described above to flow toward the central lower portion disposed the outlet of the cylindrical casing Heat can be given to the heat transfer gas through these heat transfer tubes. The dust accumulated below the cylindrical casing can be appropriately discharged from the lowermost opening / closing opening.

According to the second aspect of the present invention, since the introduction port for introducing the exhaust gas is provided along the tangential direction of the cylindrical casing, the introduction direction of the high-temperature exhaust gas is provided.
The flow of introduced exhaust gas is changed by the inner wall of the cylindrical casing and changes downward, forming a swirl flow.This improves the efficiency of heat exchange with the heat transfer tubes, and the dust in the exhaust gas adheres and accumulates on the heat transfer tubes. In addition to the effect of reducing the heat exchange efficiency over a long period of time, dust contained in the exhaust gas is more efficiently separated and removed by the centrifugal force of the swirling flow.

[0008]

Next, the present invention will be described in detail with reference to the embodiments shown in FIGS. (Example 1) First, in FIG. 1, a heat transfer gas introduction pipe 11 for introducing high-temperature exhaust gas containing dust into the upper wall surface of the cylindrical casing 1.
The inlet 12 is provided so that the introduction direction of the high-temperature exhaust gas is along the tangential direction of the cylindrical casing. On the other hand, a lower portion of the cylindrical casing 1 is formed in a conical shape, and an opening / closing opening 13 is provided at a lowermost portion thereof. Further, exhaust gas outlet tube 14 having an outlet 15 for deriving the exhaust gas after heat transfer which is open downward at the center bottom of the cylindrical casing 1 is of tubular casing 1
It is attached so as to hang down from the upper center, and is disposed so that exhaust gas after heat transfer is led out.

Furthermore, this cylindrical casing 1, its
Exhaust gas located between the inner wall of the
In the downward flow space, a number of heat transfer tubes 2 are provided for conducting the heat transfer gas in the longitudinal direction. One end of the heat transfer tubes 2 distributes the heat transfer gas to the plurality of heat transfer tubes 2. ,
It is connected to a distributor 21 that supplies. This distributor 21
Defines a space surrounding the outer periphery of the cylindrical casing 1 and serves as a flow path for distributing and supplying the heat transfer gas to the heat transfer tube 2. The other end of the heat transfer tube 2 is connected to a collector 22 for collecting and leading out the heat transfer gas. The collector 22 is provided in contact with the upper surface of the cylindrical casing 1 and serves as a flow path for collecting and transferring the heat-transferred gas after heat exchange from the heat transfer tube 2.

Next, the operating condition of the apparatus of the embodiment constructed as described above will be described. First, for the high-temperature exhaust gas containing dust, the introduction port 12 moves the exhaust gas along the tangential direction of the cylindrical casing. It is introduced into the upper part of the cylindrical casing 1 from the provided heat transfer gas introduction pipe 11. The introduced exhaust gas is swirled in the downward flow space in the cylindrical casing and flows downward, and the exhaust gas after heat transfer that opens downward at the lower center in the cylindrical casing 1 is removed. It led to the outlet 15 for deriving is derived from the exhaust gas outlet pipe 14 to the outside. During this time, the dust having a large specific gravity in the exhaust gas falls downward and accumulates in a conically formed portion below the cylindrical casing. The accumulated dust can be appropriately taken out from the opening / closing opening 13 provided at the lowermost portion.

On the other hand, the downward direction in the cylindrical casing 1
Since a large number of heat transfer tubes 2 are provided in the flow space for conducting the heat transfer gas in the longitudinal direction, the introduced exhaust gas flows downward as a swirling flow in the cylindrical casing. While being guided to the outlet 15, heat is effectively exchanged with the gas to be transferred in the many heat transfer tubes 2. The gas to be transferred is distributed and supplied from the distributor 21 to the heat transfer tube 2, and after being subjected to heat exchange, gathers in the collector 22 and is led out. In this way, in this embodiment, dust can be removed from the high-temperature exhaust gas containing dust, and the calorific value can be effectively recovered.

(Embodiment 2) In this embodiment, a large number of U-shaped heat transfer tubes 2 for conducting a heat transfer gas are disposed in a cylindrical casing 1 in a longitudinal direction thereof. , One end of which is a large number of heat transfer tubes 2
Is connected to a distributor 21 for distributing and supplying the heat-transferred gas. The distributor 21 forms a space surrounding the outer periphery of the cylindrical casing 1, and an inlet 23 for taking in a heat transfer gas is provided at a lower portion, and is connected to the heat transfer tube 2 at an upper portion. The other end of the heat transfer tube 2 is connected to a collector 22 that collects and discharges the heat transfer gas at the upper part of the cylindrical casing 1. In addition, a heat transfer gas introduction pipe 11 for introducing high-temperature exhaust gas containing dust to the uppermost wall surface of the cylindrical casing 1.
The inlet 12 has the same configuration as that of the first embodiment except that the introduction direction of the high-temperature exhaust gas is provided along the tangential direction of the cylindrical casing.

In this embodiment, as in the first embodiment, high-temperature exhaust gas containing dust is introduced into the upper part of the cylindrical casing 1 from the inlet 12. This exhaust gas flows downward as a swirling flow in the cylindrical casing, is guided to the outlet 15, and is led out of the heat transfer gas outlet pipe 14. During this time, dust having a high specific gravity in the exhaust gas flows downward. And accumulates in the conically formed portion below the cylindrical casing. On the other hand, the downward flow in the cylindrical casing 1
Since a large number of U-shaped heat transfer tubes 2 that conduct the heat transfer gas are disposed in the space , heat exchange is effectively performed with the heat transfer gas in the heat transfer tubes 2. In this way, the dust can be removed from the high-temperature exhaust gas containing the dust and the amount of heat can be effectively recovered.

[0013]

Since the dust collecting heat exchanger of the present invention is constructed as described above, heat exchange occurs in the flow of exhaust gas.
There is an excellent effect that the installation area can be reduced as much as possible by arranging the replacement heat transfer tube and combining the dust collection function and the heat exchange function. In addition, it has excellent dust collecting efficiency and heat exchange efficiency, and has an operational effect that the heat exchange efficiency is not easily reduced. Therefore, the present invention has a very high industrial value as a new dust collecting heat exchanger which has solved the conventional problems.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing a first embodiment of the present invention.

FIG. 2 is a schematic sectional view showing a second embodiment.

FIG. 3 is a schematic view of a conventional exhaust gas treatment flow.

[Explanation of symbols]

1 cylindrical casing, 12 introduction port, 13 opening / closing port, 1
4 exhaust gas outlet pipe, 15 outlets, 2 heat transfer pipes .

Claims (2)

(57) [Claims] 1. A tubular casing having an upper portion provided with an inlet for introducing high-temperature exhaust gas containing dust, a lower portion formed in a conical shape, and an opening / closing port provided at a lowermost portion, and a center in the cylindrical casing. An exhaust gas outlet pipe that hangs down from an upper portion and is disposed to open downward at a lower center portion for extracting exhaust gas after heat transfer, and an inner wall of the cylindrical casing and a front end thereof.
Downflow space of exhaust gas located between the exhaust gas outlet pipe
In dust collecting heat exchanger, characterized in that it comprises a plurality of heat exchanger tubes for conducting the heat transfer gas disposed in the longitudinal direction. 2. The heat exchanger according to claim 1, wherein the introduction port for introducing the high-temperature exhaust gas containing dust is provided along a tangential direction of the cylindrical casing in a direction in which the high-temperature exhaust gas is introduced.