JPH0630635U - Dry stoker device for stoker type combustion furnace - Google Patents

Abstract

(57) [Summary] (Revised) [Purpose] In a stoker type combustion furnace, in order to prevent the burning of dust on the drying stoker due to the high calorific content of municipal waste to be burned Even if the supply amount is significantly reduced, prevent burnout of the dry stoker and clinker on the wall of the outlet at the tip of the stoker. [Structure] A cooling air passage 20 is provided on the back side of each grate forming the dry stoker 1, and the outlet wall at the tip of the drying stoker is an air-cooling type outlet wall 13, and the outlet wall is cooled by cooling air. And the lower side of the stoker is cooled, and the high-temperature cooling air heated by the cooling of the stoker is supplied to each stoker as a drying air or a combustion air for dust through another system.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an improvement of a drying stoker device of a stoker type combustion furnace that burns solid fuel such as municipal solid waste, and the occurrence of clinker on the outlet wall at the tip of the drying stoker device and the grate of the drying stoker device. The present invention relates to a drying stoker device for a stoker type combustion furnace, which is capable of completely preventing heat damage to the stoker.

[0002]

[Prior art]

 Generally, a combustion apparatus of a stoker type combustion furnace, for example, a stoker type waste combustion furnace is composed of a dry stoker 1, a combustion stoker 2 and a post-combustion stoker 3 as shown in FIG. 3, and is pushed onto the dry stoker 1 by a pusher 4. The refuse 5 is dried on the drying stoker 1, then burned on the combustion stoker 2, and further, the combustible substances in the combustion residue are completely burned on the post-combustion stoker 3. Further, outlet walls 1a, 2a and 3a are provided below the tips of the stokers 1, 2 and 3, respectively, and the dust 5 and the combustion residue 6 are discharged from the outlet walls 1a and 2a and 3a. Along the bottom of the stokers 2, 3 or into the ash extraction chute 7 one after another. In FIG. 3, 8 is a dust input hopper, 9a, 9b and 9c are stoker rocking devices, 10 is an auxiliary burner, 11 is a hopper, and 12 is a combustion air duct.

Air for drying or combustion is supplied to each of the stokers 1, 2, 3 forming the combustion apparatus through the hopper 11 located below, and a movable grate forming the stoker is provided. By injecting air into the dust 5 or the combustion residue 6 through the gaps between the fixed grate, the dust is dried and burned, and the bottom surface of each stoker is cooled. In the stoker-type combustion furnace shown in FIG. 3, air is supplied from below the stokers 1, 2 and 3 through the hopper 11 to above the stokers. Longitudinal air passages are provided on the back side of 1, 2 and 3, and air is supplied from below the air passages to the inside of the air passages to form a gap between the movable grate and the fixed grate and each grate. Many methods of supplying air into the burned material through the air supply holes provided are also in practical use.

On the other hand, in recent years, when a large amount of air is supplied from below the dry stoker 1 due to the increase in the calorific content of the municipal waste, the waste 5 often starts burning on the dry stoker 1. I am doing it. By the way, when the dust itself starts burning on the dry stoker 1, it becomes extremely difficult to control combustion in the entire combustion furnace. Therefore, normally, the amount of air supplied to the dry stoker 1 is suppressed to prevent combustion of the dust 5 on the dry stoker 1. However, if the supply amount of the air is suppressed, the grate forming the dry stoker 1 is likely to be insufficiently cooled, and as a result, there is a problem that the grate and the like at the tip of the stoker are burned out. Further, there is a problem that clinker is likely to occur on the outer surface of the outlet wall 1a below the tip of the dry stoker 1, and the transfer of the dust 5 from the dry stoker 1 to the combustion stoker 2 cannot be performed smoothly. . The above-mentioned problem is also the same in the dry stoker 1 of the type in which an air passage is provided in the longitudinal direction on the back side of the grate and air is supplied into the dust on the stoker through the air passage. Therefore, if the air supply amount is suppressed, the cooling effect of the stoker will decrease, resulting in frequent burnout accidents of the grate.

Therefore, as a measure for preventing the burnout of the dry stoker 1 and the generation of clinker on the outer surface of the outlet wall 1a, by supplying a recirculation gas into the dry stoker 1, A method of suppressing combustion and a method of preventing the occurrence of clinker by arranging a movable block near the outlet wall 1a of the drying stoker 1 are adopted. However, the recirculation gas supply method has a remarkably large-scaled gas recirculation fan, duct equipment and the like, and there are many problems in terms of equipment costs and installation space. Further, even in the latter movable block method, the movable block itself is subjected to a large heat load, and therefore, there is a drawback that the frequency of damage is extremely high.

[0006]

[Problems to be solved by the device]

 The present invention has the above-mentioned problem in the dry stoker device forming the combustion device of the conventional stoker incinerator, that is, the stoker is burnt out due to the reduction of the air supply for drying due to the high calorie of municipal solid waste. It is easy to operate, clinker is likely to occur on the outlet wall under the tip of the stoker, and in the method of preventing the combustion of dust by supplying the recirculation gas, the equipment becomes large-scale and the equipment cost rises. The method of preventing the occurrence of clinker by the movable block is to solve the problems such as the trouble of repairing the block itself and the like, and it does not cause a sharp increase in equipment cost, and it does not cause a fire. It is intended to provide a dry stoker device for a stoker-type combustion furnace capable of preventing burning of the lattice and generation of clinker on the outer surface of the outlet wall.

[0007]

[Means for Solving the Problems]

 The present invention relates to a drying stoker 1 in which a plurality of grate 19 having cooling air passages 20 are arranged in parallel on the back side; and a front end portion and a rear end portion of the drying stoker 1 are oscillated by themselves. A slide support mechanism 17 and 18 for supporting the same; and an outlet wall 13 disposed below the front end of the drying stoker 1 and cooled by the cooling air 21; disposed below the front end portion of the drying stoker 1. An air introducing duct 15 for supplying cooling air 21 to the cooling air passage 20 of each grate 19 through the opening 22; a cooling air passage 20 of each grate 19 arranged at the rear end of the drying stoker 1. The air outlet duct 16 for discharging the cooling air 21 from the; and the stalk swinging device 9 for swinging all or part of the plurality of grate 19 in the longitudinal direction, and the outlet wall 13 and each fire. Cooling that became high temperature by cooling the grid 19 It is an basic configuration of devised the use of air 21 as combustion air, or the like.

[0008]

[Action]

 The outlet wall 13 of the drying stoker 1 is cooled by the cooling air 21 flowing through the air supply duct 14 and the air introduction duct 15, and is kept at a relatively low temperature. As a result, the occurrence of clinker on the outer surface of the outlet wall 13 is effectively prevented. The cooling air 21 that has flowed into the air introduction duct 15 flows into the cooling air passages 20 on the back side of the fixed grate 19a and the movable grate 19b through the openings 22, and while flowing through the cooling air passages 20. Cool 19 effectively. As a result, there is no burnout accident of each grate 19. The cooling air 21 heated by the cooling of each grate 19 is led to the outside through the air lead-out duct 16 and is used as combustion air from below the combustion stoker 2 and the post-combustion stoker 3 to the dust layer and the combustion residue on the stoker. It is supplied into the incinerator as secondary combustion air.

[0009]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an outline of a drying stoker apparatus according to the present invention, and FIG. 2 is a longitudinal sectional view showing an essential part of the drying stoker apparatus according to the present invention. 1 and 2, 1 is a drying stoker, 2 is a combustion stoker, 9 is a drying stoker rocking device, 13 is an air-cooled outlet wall at the tip of the drying stoker, 14 is an air introduction duct, and 15 Is an air inlet duct at the lower part of the front end of the stoker, 16 is an air outlet duct at the rear end of the stoker, 17 is a front slide support mechanism, 18 is a rear slide support mechanism, 19 is a grate, 19a is a fixed grate, and 19b is a movable grate. The drying stoker device according to the present invention comprises a drying stoker 1, an air-cooled outlet wall 13, an air introducing duct 15 at the lower front end of the stoker, an air outlet duct 16 at the upper end of the stoker, a front slide support mechanism 17, and The rear slide support mechanism 18 and the like are included.

That is, the dry stoker 1 is composed of a plurality of grates 19 arranged in a wave train as shown in FIG. 1, and in this embodiment, the fixed grates 19a and the movable grates 19b are alternately arranged. It is installed in. Further, cooling air passages 20 are formed on the back surface side of each grate 19 in the longitudinal direction thereof. In this embodiment, as shown in FIG. 1, the dry stoker 1 is configured by arranging the slender movable grate 19b and the fixed grate 19a alternately in the lateral direction of the furnace. It goes without saying that the structure itself may be any structure, for example, all the grate may be movable grate.

The cooling air passage 20 provided on the back side of each grate 19 forms a dedicated passage for so-called grate cooling air, and the air in the cooling air passage 20 is dried. It is not directly blown into the dust layer on the stoker 1. That is, the air supplied to the drying stoker is in a lower hopper of the drying stoker 1 through another drying air introducing duct (not shown) in a system different from the cooling air passing through the cooling air passage 20. Etc., and is supplied into the dust layer through the gap between the movable grate 19b and the fixed grate 19a. The cooling air from the air outlet duct 16 heated by passing through the cooling air passage 20 is used as combustion air or secondary combustion air.

The movable grate 19b in the grate 19 that constitutes the dry stoker 1 is moved in the direction of the arrow by the front end slide support mechanism 17 and the rear end slide support mechanism 18 equipped with known slide shoes 17a and 18a. It is swingably supported for a fixed distance, and is reciprocally driven in the direction of the arrow by the operation of the dry stoker swing device 9. The front end slide support mechanism 17 of the stoker 1 is provided on the upper surface of the cooling air introduction duct 15 disposed below the front end of the stoker, and cools the air introduction duct 15 and the movable grate 19b. The front end portion 20a of the air passage 20 is always in communication with the front end portion 20a through the opening 22. Similarly, the air introduction duct 15 and the tip portion 20a of the cooling air passage 20 of each fixed grate 19a are always in communication with each other, and the cooling air 21 is cooled through the air introduction duct 15 to cool both grates 19a and 19b. It is supplied into the rejecting air passage 20.

The air introduction duct 15 arranged in the lateral width direction at the lower part of the front end of the stoker is closely arranged on the back side of the outlet wall surface 13 of the drying stoker 1, and flows in the duct 15. The outlet wall surface 13 is cooled by the cooling air 21.

In this embodiment, the outlet wall 13 is indirectly air-cooled from the back side by the cooling air 21 flowing in the air introduction duct 15, but the inside of the outlet wall 13 is cooled. A pipe may be embedded and a part of the cooling air 21 may be diverted into the pipe. Further, in the present embodiment, the air duct 14 is disposed below the air introduction duct 15 at the lower part of the front end of the stalker, and the cooling air 21 flowing in the air duct 14 cools the lower portion of the outlet wall 13. It is configured to be. Furthermore, in the present embodiment, the dry stoker 1 has a configuration in which the vertically elongated fixed grate 19a and the movable grate 19b are arranged in an intersecting manner, but the horizontally elongated movable grate and the fixed grate are alternately arranged in a stepwise manner. The dry stoker 1 is formed in combination, and the cooling air 21 after cooling the back side of the outlet wall 13 via the air duct 14 is formed on the back side of each movable grate and the fixed grate. It goes without saying that the lower surface side of the stoker 1 may be cooled by flowing the gas in the lateral direction of the furnace through the passage.

Next, the operation of the drying stoker apparatus according to the present invention will be described. The dust pushed from above by the pusher (not shown) onto the drying stoker 1 is the combustion gas from below on the drying stoker 1 and the drying gas jetted into the dust from the lower surface side of the drying stoker 1 described later. Then, the movable stoker 19b is reciprocally moved by the stoker swinging device 9, so that the stoker swinging device 9 sequentially drops along the outlet wall 13 onto the combustion stoker 2.

On the other hand, the cooling air 21 introduced into the air duct 14 flows while cooling the outlet wall 13 of the drying stoker 1, and then flows into the air introduction duct 15 below the front end of the stoker. The cooling air 21 that has flowed into the air introduction duct 15 continues to cool the outlet wall 13 and flows into the cooling air passage 20 of each grate 19 while cooling the back side of the grate 19. It flows upward and becomes high temperature air, which is discharged to the outside through the air discharge duct 16.

The high temperature cooling air 21 led out from the air lead-out duct 16 is supplied as combustion air for the combustion stoker 2 and the post-combustion stoker 3 into the lower hopper of each stoker 2, 3, or It is supplied to the inside of the lower hopper of the dry stoker 1 through another system as air for drying the dust of the dry stoker 1, and is jetted into the dust layer on the stoker 1 through the gap between the fixed grate 19a and the movable grate 19b. It

[0018]

[Effect of device]

 In the drying stoker apparatus of the present invention, a dedicated passage for cooling air is provided on the back side of the fixed grate and the movable grate forming the drying stoker, and the outlet wall of the drying stoker is an air-cooling type outlet wall. The cooling wall cools the outlet wall and the bottom side of the stoker, and the high temperature cooling air heated by the cooling of the stoker is supplied to the inside of the dust layer as the dust drying air. It is configured to supply as combustion air to a combustion stoker or the like. As a result, in the present invention, the outlet wall of the drying stoker is effectively cooled by the circulation of the cooling air, and the occurrence of clinker is prevented. In addition, the cooling air that flows on the back side of each grate is for cooling only and does not jet into the dust layer, so the stoker can be cooled efficiently and sufficiently, and the stoker burns out. There are no accidents. Furthermore, the cooling air heated to a high temperature is used as drying air or combustion air, and as a result, it is possible to greatly improve drying efficiency and combustion performance. In addition, the present invention does not cause a significant increase in equipment cost as in the conventional recirculation gas supply system, and has excellent practical utility.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a drying stoker apparatus according to the present invention.

FIG. 2 is a vertical cross-sectional view showing a main part of a drying stoker device according to the present invention.

FIG. 3 is a schematic explanatory diagram of a conventional stoker-type refuse incinerator.

[Explanation of symbols]

1 is a dry stoker, 2 is a combustion stoker, 9 is a stoker rocking device, 13 is an air-cooled outlet wall, 14 is an air supply duct,
Reference numeral 15 is an air introduction duct at the lower end of the stoker, 16 is an air discharge duct at the rear end of the stoker, 17 is a slide support mechanism at the front end of the stoker, 18 is a slide support mechanism at the rear end of the stoker, 19 is a grate, 19a is a fixed grate, 19b is a movable grate, 20 is a cooling air passage, 20a is an air passage tip, 21 is cooling air, and 22 is an opening.

Claims (1)

[Scope of utility model registration request] 1. A drying stoker (1) comprising a plurality of grate (19) arranged in parallel with a cooling air passage (20) on the back side; and a front end of the drying stoker (1). And a slide support mechanism (17) for swingably supporting the rear end,
(18); and an outlet wall (1) arranged below the front end of the drying stoker (1) and cooled by cooling air (21).
3) and; disposed below the front end of the drying stoker (1),
An air introduction duct (15) for supplying cooling air (21) to the cooling air passage (20) of each grate (19) through the opening (22); disposed at the rear end of the drying stoker (1) , An air outlet duct (16) for discharging the cooling air (21) from the cooling air passage (20) of each grate (19)
And; a stoker rocking device (9) for rocking all or part of a plurality of grate (19) in the longitudinal direction, and high temperature due to cooling of the outlet wall (13) and each grate (19). A drying stoker apparatus for a stoker type combustion furnace, wherein the cooling air (21) is used as combustion air or the like.