JPH0748713Y2 - Air hole cleaning hole sealing device - Google Patents

Description

[Detailed description of the device] [Industrial applications]

The present invention is provided on the furnace wall for injecting the combustion air of the soda recovery boiler for recovering chemicals (soda) and the mixed air with the odorous gas by burning the waste liquid (black liquor) generated in the pulp manufacturing process. TECHNICAL FIELD The present invention relates to a cleaning hole sealing device for an air hole, which prevents leakage from a cleaning hole located at a position facing the air hole of a wind box connected to the air hole.

[Prior art]

Generally, the combustion air of the soda recovery boiler is introduced through a wind box connected to each air hole of the primary to tertiary air holes provided in the boiler water pipe, but the periphery of the air hole inside the furnace. , The smelt (melted material of black liquor containing concentrated soda) is cooled and solidified by the combustion air, gradually closing the air holes and aggravating the combustion state. Therefore, it is necessary to clean and monitor the air holes regularly or frequently. The temperature of the combustion air is usually 150 ° C to 200 ° C, but the combustion air also contains odorous gas. Therefore, leakage of the combustion air from the cleaning holes of the air holes provided in the combustion air wind box causes problems in terms of energy loss, surrounding environment, and safety. As a measure for preventing this leakage, there are methods shown in FIGS. 3 and 4, for example. FIG. 3 shows that the inside of the cleaning hole 10 located at a position facing the air hole 12 of the wind box 9 connected to the air hole 12 is rotated by 90 ° or more toward the inside of the furnace with the upper part as a fulcrum to seal all the cleaning holes. The square or circular lid 13 that seals the cleaning hole 10 by its own weight. When cleaning the air hole 12, the lid 13 is pushed up by the cleaning rod 8 to clean the air hole 12, but when the lid 13 is pushed up, the combustion air leaks greatly, and it is used as it is until now. Less often done. At this time, the cleaning rod 8 is at least 1
Can be covered by books. This method is used for a relatively small number of air holes 12, but in recent years, a large number of air holes 12 have been installed in the recovery boiler along with the increase in size, and therefore the cleaning rod 8 is replaced by an air outlet. The holes 12 are provided in the same number or automated as is known. FIG. 4 shows a Belize-type sealing device, in which at least one cleaning rod 8 is inserted into one of the air holes 12 and is inserted into the cleaning hole 10 opposite to the wind box 9 connected to the air hole 12. Then, the bellows 14 is sealed and fixed around the cleaning hole 10 on the outer surface of the wind box 9, and the cleaning rod 8 is fixed and sealed on the outside of the wind box 9,
This device expands and contracts the bellows 14 by advancing and retracting the cleaning rod 8 to prevent the leakage of combustion air. The material of the bellows 14 is heat resistant, but it must be made of cloth to effectively expand and contract. I don't get. For this reason, if the expansion and contraction operation is frequently performed, it deteriorates over time, cracks occur, and due to fluctuations in the draft in the furnace, often sparks at a temperature of 700 to 1000 ° C. enter the bellows 14 to cause burnout and burnout. Due to the generation of holes due to this, it becomes difficult to exert the sealing function of the bellows 14, there is a problem that the bellows 14 must be converted during the operation of the recovery boiler, and a large number of air holes 12 are installed. Therefore, conversion of bellows 14 is economically problematic.

[Problems to be solved by the device]

It is an object of the present invention to provide a cleaning hole sealing device for air holes without causing problems such as surrounding environment problems due to leakage of combustion air, burnout and accompanying holes.

[Means for Solving the Problems]

The present invention is provided on the furnace wall for injecting the combustion air of the soda recovery boiler for recovering chemicals (soda) and the mixed air with the odorous gas by burning the waste liquid (black liquor) generated in the pulp manufacturing process. In the air hole, the wind box connected to the air hole has a fixing metal fitting for fixing the sealing material at both ends to the cleaning hole at a position facing the air hole, and further, one side can be connected and fixed to the air box. In addition, a steel sleeve equipped with a slidable spherical plain bearing is attached, and when the cleaning rod slides on the inner surface of the steel sleeve, it makes contact with and seals the sealing material fixed to the fixing member and the outer surface of the cleaning rod. It is a cleaning hole sealing device for air holes. The shape of the cleaning rod is not limited as long as it is possible to clean the air holes.
Any material may be used as long as it has heat resistance and corrosion resistance.

[Action]

The cleaning hole sealing device of the present invention allows the steel sleeve 1 into which the cleaning rod 8 is inserted to be attached to the wind box 9, and the cleaning rod 8 to move vertically and horizontally to clean the air holes 12. Therefore, the spherical plain bearing 5 is appropriately fixed so that it can be sufficiently followed, and the case of the spherical plain bearing 5 has a cleaning hole 10 at a position facing the air hole 12 of the wind box 9 connected to the air hole 12. Since they are fixed concentrically and the space between the steel sleeve 1 and the cleaning rod 8 is sufficiently sealed by the seal material 3 and the oil seal 4, the high temperature combustion air in the wind box and the mixed malodor (EN) A cleaning hole sealing device for air holes, which can prevent leakage of gas and can solve the problems of heat energy loss and the surrounding environment all at once.

【Example】

The present invention will be described based on an embodiment shown in the drawings. FIG. 1 is a schematic view showing a state where the sealing device of the present invention is installed in a wind box, and FIG. 2 is a diagram showing an operating state of the present invention. The cleaning rod 8 inserted in the steel sleeve 1 is held at both ends of the steel sleeve 1 by a heat-resistant and wear-resistant seal material 3 that can be easily attached and detached in the gap between the both, and the seal material 3 is also attached. It is a sliding part that moves smoothly back and forth. The sealing material 3 inserted into both ends of the steel sleeve 1 is fixed by the steel seal holders 2a and 2b for preventing the sliding and sliding of the cleaning rod 8 from the slipping and dropping. The steel seal retainer has a penetrating portion with which the cleaning rod 8 can slide sufficiently, a gap between the cleaning rod 8 and the cleaning rod 8 is minimum, and screw portions provided at both ends of the outer peripheral surface of the steel sleeve 1. A screw similar to the above is applied to the inner surface, and the steel seal holders 2a and 2b are fixed to the steel sleeve 1 by tightening the screw. When tightening the screws, it is better to apply a heat-resistant tape or a liquid sealing material in the gaps between the screw parts. The steel seal holder 2b has an oil seal that is separate from the seal material 3 so that it contacts the outer peripheral surface of the cleaning rod 8 separately from the inner surface of the sealing member 3 and that the cleaning rod 8 does not slide and is removable. 4 is stored. As described above, the assembled steel sleeve 1 is provided with the spherical slide bearing 5 at an appropriate position for sliding vertically and horizontally, and the bearing slides by the cleaning rod 8 and the steel sleeve 1,
It is fixed by a removable fixing ring 7 so as not to move on the outer peripheral surface of the steel sleeve 1. Two fixing rings 7 are fitted in the two grooves provided at the position where the spherical plain bearing 5 is to be fixed to the outer circumference of the steel sleeve 1 and at the position where both ends of the spherical plain bearing 5 are sandwiched, and the fixing ring 7 is fixed ring. The outer periphery of 7 is slightly larger than the outer periphery of the steel sleeve 1, and the spherical slide bearing 5 is fixed by slightly protruding from the outer peripheral surface of the steel sleeve 1. The fixing ring 7 is made of steel and may have a square or circular cross section. The case of the spherical plain bearing 5 is a wind box 9 connected to the air hole 12.
Is fixed on the concentric circle of the cleaning hole 10 located at the position opposite to the air hole 12 of the steel sleeve 1. One of the steel sleeves 1 is installed in the wind box 9 and the other is installed outside the wind box 9, , Cleaning stick 8
The seal retainer 2b provided with the oil seal 4 that contacts the outer peripheral surface is installed outside the wind box 9, and the heat-resistant packing 6 is sandwiched between the case of the spherical plain bearing 5 and the wind box 9. The sealing property is maintained so that the combustion air does not leak from the wind box 9. A heat-resistant lubricant may be injected into the sliding surfaces of the cleaning rod 8 and the spherical plain bearing 5 so that the sliding is smooth.

[Effect of device]

According to the present invention, it is possible to prevent leakage of high-temperature combustion air and mixed malodorous gas in a wind box, and to solve thermal energy loss and environmental problems in the surrounding area all at once. A sealing device is provided. Further, according to the present invention, since it is made of steel, there is no damage to the sealing device due to blowing out of high temperature sparks due to the fluctuation of the draft in the furnace. Therefore, it is possible to obtain a stable sealing property without requiring replacement of the sealing device as a whole, and thereby to provide a sealing device capable of greatly reducing the cost of replacement and the like.

[Brief description of drawings]

FIG. 1 is a schematic view showing a state in which the sealing device of the present invention is installed in a wind box. FIG. 2 is a view showing an operating state of the present invention.
3 and 4 are schematic views of a conventional air hole cleaning hole sealing device. 1: Steel sleeve, 2a, 2b: Seal material retainer, 3: Seal material,
4: Oil seal, 5: Spherical plain bearing, 6: Seat packing,
7: Fixing ring, 8: Cleaning stick, 9: Wind box, 10: Cleaning hole, 11: Looking window, 12: Air hole, 13: Lid, 14: Bellows

Claims (1)

[Scope of utility model registration request] 1. A furnace wall for introducing combustion air of a soda recovery boiler for recovering chemicals (soda) and mixed air with odorous gas by burning waste liquid (black liquor) generated in a pulp manufacturing process. In the air hole, the air box connected to the air hole has the fixing metal fittings for fixing the seal material at both ends in the cleaning hole facing the air hole, and one side can be connected and fixed with the air box. And, a steel sleeve equipped with a slidable spherical plain bearing is attached, and when the cleaning rod slides on the inner surface of the steel sleeve, the sealing material fixed to the fixing metal and the outer surface of the cleaning rod are brought into contact and seal. Air hole cleaning hole sealing device.