JP2802553B2 - Opening and closing device of damper in high pressure gas furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an opening and closing device for a damper in a high-temperature gas furnace such as an incinerator for waste such as tires and plastics.

[0002]

2. Description of the Related Art In an incinerator for waste such as tires and plastics, a flue is provided between a primary combustion furnace and a secondary combustion furnace, and waste is incompletely burned in the primary combustion furnace. Air is mixed in the flue gas into the complete combustion gas, sent to the secondary combustion furnace, and completely burned in the secondary combustion furnace. Further, in order to utilize the thermal energy, the high-temperature gas of the secondary combustion furnace may be sent to the heat exchange casing.

[0003] In such a high-temperature gas furnace, a damper is provided in a flue or a furnace (generally referred to as a flue in this specification) in order to cut off a high-temperature gas or adjust a feed amount.

Conventionally, this type of damper opening / closing device is provided with a drawer port for lifting the damper on the upper wall of the flue, and the damper inserted in the drawer port is moved up and down by an elevator. It was opening and closing.

[0005]

The drawer outlet of the damper is not merely an open type, but is generally formed in a cylindrical shape for guiding the damper to be pulled up, but in any case, it is necessary for the opening and closing operation of the damper. Because a large dimensional margin is required, a gap is provided between the drawer and the damper, and the disadvantage of injecting high-temperature and high-pressure gas from the gap is inevitable. There was a problem that it caused deterioration and danger.

Since the inside of the flue is affected by very high temperatures,
A material suitable for the seal cannot be used for the outlet, which also causes the inability to avoid gas ejection. And, the gap at the outlet of the damper becomes larger as the size of the damper becomes larger, and this has been a constraint for producing a large-scale high-temperature gas furnace.

[0007] In addition, the high temperature restricts the use of a material suitable for a seal for the damper to partition the flue.
It was difficult to separate high-temperature and high-pressure gas in the flue, and it was not possible to fine-tune the gas flow rate in the furnace.

The present invention has been made in view of the above situation,
It is an object of the present invention to provide a damper opening / closing device in a high-temperature gas furnace in which a high-temperature, high-pressure gas never blows out from an outlet of a damper provided in a flue and the damper has a high ability to divide the flue. .

[0009]

In order to achieve the above-mentioned object, the present invention provides an inverted box-shaped damper cover which seals the outlet of a damper on a flue, and on both sides of the flue. A vertical guide box that can receive the damper is provided, the damper is formed in a hollow where the fluid is injected, and an overflow port that holds the level of the internal fluid is provided at the upper end on both sides of the damper. A seal pipe for injecting fluid is provided, and the lower end is formed so that it is always immersed below the surface of the fluid in the damper, and the fluid overflowing from its mouth is transferred to the guide box at both overflow ports of the damper. The outflow pipes are connected, and both outflow pipes are vertically inserted into the guide box, and the fluid discharge pipes to the outside of the flue are connected so that the water level filled with fluid is maintained in the guide boxes. The elevator lifting the damper provided above the bar, to constitute a switchgear of the damper in HTGR its hanging member is connected internally to the damper through the seal tube of the damper cover.

[0010]

During operation of the high temperature gas furnace, fluid is constantly injected from the seal tube into the damper. The outlet of the damper provided in the flue is sealed by the damper cover, and the portion where the flue can communicate with the outside is only the seal tube, but the seal tube is completely sealed by the fluid.
In other words, the level of the fluid injected from the seal pipe into the damper is always maintained at the height of the overflow, and the lower end of the seal pipe is immersed below the fluid level in the damper, regardless of the height of the damper. The damper cover is completely sealed from the outside because it is sealed by the water level, and the hot gas never blows out.

Further, since the guide box is filled with the fluid overflowing from the damper, the heat resistance of the damper and the guide box is enhanced, the sealing performance is improved by joining the both, and the ability of the damper to separate the flue is improved. I do.
In addition, the lining can be made of a material suitable for the sealing property, so that the separating ability is further improved.

[0012] Since the outflow pipe connected to the overflow of the damper is inserted into the guide box, the fluid is discharged to the outside through the guide box without hindering the vertical movement of the damper.

Among the fluids, liquid and powder are most suitable because water is easily obtained at a low cost and the water level is easily maintained.

[0014]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIGS. 1 to 3 show one embodiment, which is applied to a flue 1 which sends a high-temperature gas from a secondary combustion furnace to a heat exchange casing (in the direction of the arrow in FIGS. 2 and 3). However, the present invention can be applied not only to the flue from the primary combustion furnace to the secondary combustion furnace, but also to the case where the furnace body is partitioned by a damper.

The opening / closing device of the damper includes, besides the flue 1, a damper cover 4, a damper 2 accommodated therein, a pair of left and right guide boxes 7, 7 for receiving the damper 2 on the heat exchange casing side, and a damper 2; And an elevator 9 that moves up and down.

The flue 1 is composed of an upper wall 11, a lower wall 13, left and right side walls 15, 15, and a drawer 17 of the damper 2 is formed in the upper wall 11 to be slightly wider than its thickness. , 15 are provided with guide grooves 19, 19 of the damper 2 and fitting portions 21, 21 of the guide boxes 7, 7 are provided.

The damper cover 4 is in the shape of an inverted box that covers the flue 1, and is fixed by projecting upward from the outlet 17, and providing a water outlet 25 at the center of the upper wall 23. The seal pipe 27 is suspended from the upper surface of the flue 1 to a height of about the lower surface of the upper wall 11.

The damper 2 is formed in a hollow body for water cooling, and has a hole 31 into which a seal tube 27 is inserted at the center of the upper end.
Is provided. Then, when it reaches the lower wall 13 of the flue 1, the lower end of the seal tube 27 is located near the upper end of the damper 2 (solid line in FIG. 1). Also, overflows 33, 33 are provided at both left and right ends so that the water level P is held at the upper end of the damper 2, and the outflow pipes 31, 31 are connected to the overflows 33, 33, respectively.

The position of the overflow 33 is always above the lower end of the seal pipe 27. Therefore, when water is injected from the seal pipe 27 into the damper 2, the lower end of the seal pipe 27 is placed below the water surface. Must be immersed in the seal pipe 2
7 is completely sealed. Therefore, regardless of the height of the damper 2, the hot gas never blows out from the seal tube 27.

The outflow pipe 31 is inserted into the guide box 7 and has a lower end (when the damper 2 is closed).
The damper 2 is located at the lower end of the guide box 7.
Is formed in such a length that the lower end does not come off from the guide box 7 even if it is opened and rises to the limit.

The guide box 7 has a rectangular box shape that is vertically long and has only an upper end opened, and is formed integrally with the damper cover 4 in the flue 1. A drain pipe 35 is attached to the lower end, and a drain port 37 of the drain pipe 35 is opened at a height near the upper end of the guide box 7, and the guide box 7 holds a water level at the position of the drain port 37. You.

The lower end of the outflow pipe 31 is immersed below the water surface in the guide box 7 irrespective of the height position of the damper 2. As described above, if the water level is held at the upper end of the guide box 7, the mounting position of the drain pipe 35 does not matter.

The elevator 9 is provided above the damper cover 4 and uses a chain as a suspending member 39 and winds it by a drum rotated by a motor. The hanging member 39 is inserted and connected to the bottom surface.

The damper 2, the guide box 7, and the damper cover 4 are formed of a heat-resistant metal, but may be lined with a refractory material.

FIG. 4 shows another embodiment. In this case, the damper 2 is easily received by the guide boxes 7, 7, and the damper 2, the guide boxes 7, 7, and the damper cover are arranged in the flow direction of the high-temperature gas. 4 is inclined, and is basically the same as the above embodiment, but as a result of maintaining the joint between the damper 2 and the guide box 7, the sealing performance is improved, and the ability to separate the high-temperature gas is improved. Further improve.

A hydraulic cylinder is used for the lift 9, and its rod serves as a suspension member 39.

[0028]

As described above, according to the present invention, there are the following excellent effects.

1) A damper cover for closing the outlet of the damper is provided upright in the flue, and a seal pipe for injecting fluid into the damper is provided at the center of the damper cover, and the fluid injected from the seal pipe fills the damper. Regardless of the vertical position of the damper, the lower end of the seal tube is immersed below the surface of the fluid inside the damper, so the only seal tube that structurally communicates with the outside world is completely sealed by that surface, The high-temperature gas never blows out to the outside, and it is possible to reliably prevent the work environment from being deteriorated and dangerous due to the leakage of the high-temperature gas.

2) A guide box for sealing is provided on both sides of the flue for receiving the damper, and not only the damper but also the fluid flows through the guide box, so that the fire resistance and the sealing property are very good. Due to high temperature,
The ability to cut high-pressure gas is extremely high, and the flow rate of high-temperature, high-pressure gas can be finely adjusted.

3) Since the fluid injected into the damper is transferred to the guide box and then discharged to the outside, the process of discharging the fluid in the damper that moves up and down is extremely appropriate, and the leakage of the fluid in the flue can be prevented. .

4) For lifting the damper, the suspension member of the elevator is passed through the seal pipe and connected to the inside of the damper, so that the damper can be reliably pulled up and there is no danger of the suspension member being cut off by contact with the hot gas. It is safe.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view showing a damper opening / closing device taken along line AA of FIG. 2;

FIG. 2 is an explanatory cross-sectional view of a flue showing an opening and closing device of a damper as viewed from a plane of a flue.

FIG. 3 is an explanatory sectional view taken along line BB of FIG. 2;

FIG. 4 is an explanatory sectional view corresponding to FIG. 3 showing another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flue 2 Damper 4 Damper cover 7 Guide box 9 Elevator 17 Outlet 23 Upper wall of damper cover 27 Seal pipe 31 Outflow pipe 33 Overflow 35 Exhaust pipe 39 Suspension member P Fluid water level in damper

Claims (1)

(57) [Claims] An inverted box-shaped damper cover is provided on the flue to seal the outlet of the damper, and a vertically long guide box is provided on both sides of the flue to receive the damper. The damper cover is provided with an overflow port at the upper end on both sides of the damper to hold the water level of the internal fluid, a seal pipe for injecting the fluid into the damper is provided at the center of the upper wall of the damper cover, and the lower end is provided inside the damper. It is formed so that it is always immersed below the surface of the fluid, and both overflow ports of the damper are connected with outflow pipes that transfer the fluid overflowing from the mouth to the guide box, and both outflow pipes are vertically inserted into the guide box. Connect the discharge pipe of the fluid to the outside of the stack so that the water level filled with fluid is maintained in the guide box, and install an elevator that lifts the damper above the damper cover. Wood damper switchgear in HTGR, characterized in that it is connected internally to the damper through the seal tube of the damper cover.