JPH0630645U - Chimney condensation prevention device - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent dew condensation on the inner wall of the stack due to high temperature exhaust gas at the beginning of combustion and to prevent the generation of ash dust. [Composition] At least the partition member for preventing dew condensation that partitions the chimney up and down at the opening position of the exhaust gas introduction passage that guides the exhaust gas from the incinerator to the chimney into the chimney, at least the above described Arranged so that the part from the opening to the flue is inclined, and this partition member changes the high temperature exhaust gas flowing from the opening to a smooth flow to the upper part of the chimney and blocks the flow of exhaust gas to the lower part of the stack. To do.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a chimney dew condensation prevention device used in a large incinerator such as an urban refuse incinerator.

[0002]

[Prior art]

 The structure of the chimney used in the conventional incinerator will be described with reference to FIG. In FIG. 4, a chimney 1 includes a vertically extending flue 2, a hopper portion 3 formed at a lower portion of the flue 2, a drain pipe 4 connected to a lower end of the hopper portion 3, and a drain pipe 4 thereof. The drain drain valve 5 provided in the.

The flue 2 and the hopper portion 3 have a heat insulating structure in which the outer circumference of a stainless steel pipe is covered with a protective material, metal lath, mortar, or the like. Further, one end of an exhaust gas introduction duct 6 communicating with the flue 2 is connected to the side wall of the chimney 1 located above the hopper portion 3, and the other end of the exhaust gas introduction duct 6 is a large incinerator (not shown). Connected).

[0004]

[Problems to be solved by the device]

 In the chimney configured as described above, when the high-temperature exhaust gas generated in the incinerator is ejected into the chimney 1 through the exhaust gas introduction duct 6, the high-temperature exhaust gas flows upward in the flue 2 along with ash dust, A flow in a direction of colliding with the inner wall surface A of the flue 2 that faces the opening of the introduction duct 6 and a flow toward the hopper unit 3 side are generated.

By the way, in an incinerator that operates in the daytime and stops at night like a quasi-coupling furnace, when high temperature exhaust gas from the incinerator flows into the chimney 1 at the start of combustion, When it comes into contact with the cold air of the flue, it is rapidly cooled, and particularly much dew condensation occurs on the inner wall surface A of the flue 2 and on the inner wall surface of the lower portion of the flue where stagnation is large.

As a result, the dew drops become water drops and drop onto the hopper unit 3, and fine dust particles in the exhaust gas adhere to the dew drops. Then, when the constant incineration time of the incinerator elapses and the cooled air in the flue 2 disappears, the dew condensation phenomenon disappears, so the dust adhering to the dew condensation part dries, and this dried dust is collected in the flue 2 Large particles are separated from the inner wall surface A of the plant and separated, and a part of them is discharged into the atmosphere from the chimney together with the exhaust gas, and becomes ash dust, which adversely affects the environment around the incinerator.

Further, ash dust that is not released to the atmosphere may be accumulated in the hopper portion 3 at the lower part of the chimney and may block the drain pipe 4. Therefore, it is necessary to remove accumulated ash dust relatively frequently.

The present invention has been made in view of the above points, and an object thereof is to prevent dew condensation on the inner wall of the chimney due to high-temperature exhaust gas in the initial stage of combustion and to prevent dew ash dust from being generated. To provide a device.

[0009]

[Means for Solving the Problems]

 The dew condensation prevention device for a chimney according to claim 1, wherein the exhaust gas from the incinerator is discharged into the air, the exhaust gas is introduced into an exhaust gas introduction passage that guides the exhaust gas from the incinerator to the chimney, A dew condensation preventing partitioning member for vertically partitioning the inside of the chimney with the opening of the introduction passage as a boundary is provided so that at least a portion extending from the opening to the flue is inclined.

In the dew condensation preventing device for a chimney according to claim 1, the partition member is configured to be divided into a plurality of parts.

[0011]

[Action]

 In the first aspect, the inclined partition member changes the high-temperature exhaust gas ejected from the opening into the chimney into a smooth flow to the upper part of the chimney and blocks the flow of the high-temperature exhaust gas to the lower part of the chimney.

As a result, even if hot exhaust gas is introduced into the chimney at the beginning of combustion when there is cold air in the chimney, dew condensation does not occur on the inner wall of the chimney, and the generation of ash dust can be prevented.

According to the second aspect, the partition member can be easily attached to and detached from the chimney.

[0014]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a main portion of an incinerator chimney having a dew condensation preventing device of the present invention, FIG. 2 is a perspective view of a partition member, and FIG. 3 is an enlarged sectional view taken along line 3-3 of FIG. .

In FIG. 1, reference numeral 10 denotes a chimney that discharges exhaust gas from a large-scale incinerator (not shown) such as an urban refuse incinerator into the air. The chimney 10 is provided in the drain pipe 13 and a vertically extending flue 11, a hopper portion 12 formed at a lower portion of the flue 11, a drain pipe 13 connected to a lower end of the hopper portion 12, and a drain pipe 13. A drain drain valve 14 is provided.

The flue 11 and the hopper portion 12 have a heat insulating structure in which a stainless steel pipe 15 and an outer periphery of the stainless steel pipe 15 are covered with a heat insulating material 16, a metal lath 17 and a mortar 18.

Further, an exhaust gas introducing passage 19 for guiding exhaust gas from the incinerator into the flue 11 is connected to a side wall of the chimney 10 located above the hopper portion 12, and the exhaust gas introducing passage 19 is connected to the flue passage. It has the same heat insulation structure as 11.

An elliptical dew condensation preventing partition member 20 is disposed inside the flue 11 so as to face the opening 19 a of the exhaust gas introducing passage 19. The partition member 20 partitions the exhaust gas introduction passage 19 into upper and lower parts of the flue 11 with the opening 19a as a boundary, and changes the high temperature exhaust gas ejected from the opening 19a into a smooth upward flow of the flue 11. In addition, water drops due to rain, snow, etc. that fall into the flue 11 when combustion is stopped do not stay.

Therefore, the partition member 20 is inclined at a predetermined angle downward with respect to the opening 19a, and the intersection line at which the extension line L1 of the lower end edge of the opening 19a and the center line L2 of the chimney 10 directly intersect. The center of the partition member 20 coincides with the arrangement relationship.

Further, a notch 23 is formed on the lower inclined side of the partition member 20 in order to allow rainwater or the like that has poured onto the partition member 20 to flow down to the hopper portion 12. As shown in FIGS. 2 and 3, the elliptical partition member 20 is divided into two in the longitudinal direction, and the lower surface of the one partition plate 20a has a pair of channel members 21a extending in the inclination direction of the partition member 20. , 21b are fixed by welding or the like, and a channel member 21c is fixed by welding or the like to the lower surface on the one end side of the other division plate 20b, and the other end edge of the other division plate 20b is superposed on the channel material 21a. As a result, the partition member 20 is configured.

In order to support the partition member 20 configured as described above in an inclined manner in the flue 11, a pair of steel support members are provided in the flue 11 in a direction orthogonal to the inclination direction of the partition member 20. The rods 22a and 22b are fixed horizontally.

In the chimney 10 configured in this way, when the high-temperature exhaust gas generated in the incinerator is ejected from the opening 19a into the flue 11 through the exhaust gas introduction passage 19, the high-temperature exhaust gas is changed to the arrow in FIG. Flow as shown.

Of these, the high-temperature exhaust gas that is going straight toward the inner wall of the flue 11 facing the opening 19 a is changed into a gas flow that flows upward in the flue 11 along the inclined surface of the partition member 20. At the same time, the gas flow is blocked by the partitioning member 20 while trying to flow toward the hopper portion 12.

Therefore, even if the cooled air is present in the flue 11 at the early stage of combustion, the air is pushed upward by the flow of the hot flue gas indicated by the arrow, and the hot flue gas is heated as in the conventional case. The degree to which the is mixed with cold air and cooled is greatly reduced.

As a result, there is almost no condensation on the partition member 20 and the inner wall of the flue 11. Further, since the cooling air on the hopper portion 12 side is blocked by the partitioning member 20, the high temperature exhaust gas is not cooled by the cold air on the hopper portion 12 side.

Therefore, in the present embodiment as described above, even if the high temperature exhaust gas flows into the stack 10 at the initial stage of combustion, it is possible to prevent dew condensation on the inner wall of the flue 11 and to prevent the fine particle dust contained in the exhaust gas. It does not solidify into large particles due to dew condensation and can prevent the generation of fallen dust.

Further, even if rainwater or the like that has entered from the upper opening of the flue 11 at the beginning of combustion is poured onto the partition member 20, the rainwater or the like flows down on the inclined partition member 20 toward the notch 23 side, It drops into the hopper section 12.

Therefore, there is no possibility that the fine particle dust in the exhaust gas adheres to the partitioning member 20 to generate fallen ash dust as in the conventional case. Furthermore, the partition member 20 having a two-part structure facilitates attachment and detachment of the partition member 20 to and from the flue 11.

The partitioning member 20 in the present invention is not limited to the configuration shown in the above embodiment, and may be, for example, a V-shape, a C-shape, an inverted V-shape, or a gentle arc shape. Further, the dew condensation preventing device of the present invention is not limited to the chimney having the structure shown in the above-mentioned embodiment, and can be applied to, for example, a chimney having a steel pipe on the outside, a heat-insulating castable on the middle, and a fireproof and acid-resistant castable on the inside.

[0030]

[Effect of device]

 As described above, according to the present invention, the exhaust gas introduction passage that guides the exhaust gas from the incinerator to the chimney is opened and closed in the chimney at the opening position of the exhaust gas introduction passage into the chimney. The partitioning member for dew condensation prevention is arranged so that at least the part from the opening toward the flue is slanted, and this partitioning member smoothes the high-temperature exhaust gas flowing from the opening into the stack to the upper part of the stack. However, even if hot exhaust gas flows into the chimney at the beginning of combustion, dew condensation does not occur on the inner wall of the chimney, and the fine particles in the exhaust gas duct form the inner wall of the chimney. It is possible to prevent the cause of falling ash dust by adhering to, and peeling after drying.

Further, in the present invention, by making the partition member separable, the partition member can be easily attached to and detached from the chimney.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view showing an embodiment of an incinerator chimney having a dew condensation preventing device of the present invention.

FIG. 2 is a perspective view of a partition member according to this embodiment.

FIG. 3 is an enlarged cross-sectional view taken along line 3-3 of FIG.

FIG. 4 is a schematic cross-sectional view of a conventional incinerator chimney.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Chimney 11 Flue 12 Hopper 13 Drain pipe 14 Drain drain valve 19 Exhaust gas introduction passage 19a Opening 20 Partitioning member 23 Notch

Claims (2)

[Scope of utility model registration request] 1. In a chimney for discharging exhaust gas from an incinerator into the air, the opening of the exhaust gas introduction passage is bounded by the opening position of the exhaust gas introduction passage leading the exhaust gas from the incinerator to the chimney into the chimney. A dew condensation preventing device for a chimney, wherein the dew condensation preventing partitioning member for vertically partitioning the inside of the chimney is arranged so that at least a portion extending from the opening to the flue is inclined. 2. The dew condensation prevention device for a chimney according to claim 1, wherein the partition member is configured to be divided into a plurality of parts.