JP2016211784A - Furnace wall structure of an incinerator and its modification method - Google Patents

Abstract

An object of the present invention is to provide an incinerator and a method for remodeling an existing incinerator in which the generation of clinker is suppressed while saving energy while having a simple structure. An incinerator having a primary combustion chamber and a secondary combustion chamber, wherein a water-cooling jacket is formed on a furnace wall on the primary combustion chamber side, and the furnace wall on the secondary combustion chamber side has a refractory structure. It is formed by a body. [Selection] Figure 1

Description

  The present invention relates to a furnace wall structure of an incinerator used for incineration of general waste and industrial waste, and a method for remodeling an existing incinerator.

In an incinerator, it is difficult to sufficiently suppress the production of dioxins by simply putting waste into the furnace, and only pyrolysis and primary combustion. The unburned content in the exhaust gas is burned above the primary combustion chamber. Some have a secondary combustion chamber.
From the viewpoint of energy saving, the furnace wall structure is formed of a refractory structure and cooling is desired to be avoided, but clinker is likely to be generated on the inner wall of the furnace wall.
Patent Document 1 discloses a furnace wall structure in which the outer peripheral side of the furnace main body has a triple structure including an air layer, a water-cooled layer, and a refractory material structure from the outside.
However, such a triple structure is complicated and expensive.
The inventors of the present invention have a refractory structure that is easier to maintain a high temperature during combustion of exhaust gas, and clinker is relatively less likely to occur in the furnace wall of the secondary combustion chamber.
On the other hand, focusing on the fact that the clinker is easily generated in the primary combustion chamber and needs to be cooled, the present invention has been achieved.
In addition, Patent Document 2 discloses a furnace wall structure in which a water tube group is divided into a primary combustion chamber and a secondary combustion chamber, but the structure is complicated. For example, for improving an existing refractory structure incinerator It is difficult to apply.

Japanese Patent Laid-Open No. 10-38234 Japanese Patent No. 3950349

  SUMMARY OF THE INVENTION An object of the present invention is to provide an incinerator and a method for remodeling an existing incinerator in which the generation of clinker is suppressed while saving energy while having a simple structure.

  An incinerator according to the present invention is an incinerator having a primary combustion chamber and a secondary combustion chamber, wherein a water cooling jacket is formed on the furnace wall on the primary combustion chamber side, and the furnace wall on the secondary combustion chamber side Is formed of a refractory structure.

Here, the incinerator is a primary combustion chamber for pyrolyzing and burning waste, and secondary combustion in which unburned components in the exhaust gas generated in the primary combustion chamber are burned by an auxiliary combustion fan or auxiliary combustion burner. If it is an incinerator equipped with a chamber, the structure of the furnace is not limited.
For example, it may be a cylindrical incinerator or a box incinerator, a stoker type incinerator, a kiln type incinerator, or a combination thereof.
The water cooling jacket refers to a layer in which jacket-like cooling water provided along the outer periphery of the furnace wall flows.
For example, it is made of a steel plate or the like.
The refractory structure is formed of a refractory brick, a ceramic material, or the like. By forming the furnace wall with a refractory, the refractory structure can withstand a high exhaust gas combustion temperature and also has a heat retention effect of the combustion gas.

In the present invention, if a water cooling jacket is provided on the outer peripheral wall of the primary combustion chamber of the furnace, a refractory layer having a thickness smaller than that of the refractory on the secondary combustion chamber side may be provided on the inner peripheral portion.
In addition, the boundary between the water-cooling jacket on the primary combustion chamber side and the refractory structure on the secondary combustion chamber side does not necessarily have to be divided in the vertical direction. The overlap structure provided may be used.
In this way, the refractory on the outer wall of the primary combustion chamber portion of the existing incinerator where the entire outer periphery of the furnace is made of a refractory structure can be partially removed or thinned to attach the water cooling jacket. .
As a result, it is possible to suppress the occurrence of clinker in the primary combustion chamber while maintaining the gas heat insulation effect in the secondary combustion chamber with the existing refractory structure, and the combustion state in the furnace that varies with combustion Can be absorbed and stabilized with cooling water.

In the present invention, the water cooling jacket is connected to a water storage tank for storing cooling water and an evaporation chamber, the evaporation chamber is connected to the water storage tank via the air / water separator, and the evaporation You may make it have two systems with the overflow system which returns to a water storage tank when the water level of a chamber becomes more than predetermined.
If it does in this way, the cooling water in a jacket will return the water condensed by the steam separator through the evaporation chamber to a water storage tank, and the overflowed cooling water will be returned to a water storage tank via an overflow system.

  In the present invention, the water-cooling jacket is formed on the outer peripheral wall on the primary combustion chamber side while forming the outer peripheral wall on the secondary combustion chamber side with a refractory structure, so that generation of clinker can be suppressed while saving energy. .

The structural example of the incinerator which consists of an outer wall structure concerning this invention is shown.

The incinerator 100 shown in FIG. 1 is an example of a stoker-type incinerator, and may be newly established, or an existing furnace may be modified in this way.
The furnace body 10 includes a primary combustion chamber 10A having a grate 14a and a pusher device 14 on its side walls, and a secondary combustion chamber 10B formed thereabove.
The primary combustion chamber 10A has a combustion fan 16 and, if necessary, an ignition burner and an auxiliary fan.
Further, the furnace bottom portion 11 is provided with an ash discharging mechanism, and provided with an ash discharge port 15 and the like.
The secondary combustion chamber 10B has an auxiliary combustion burner 17.
Here, the unburned gas is combusted and discharged out of the furnace through the high temperature exhaust port 18, and thereafter, a temperature reduction process, a neutralization process, a filter process and the like are performed according to a conventional method.

A water cooling jacket 12 is attached to the outer peripheral wall of the primary combustion chamber 10A below the upper part of the grate 14a, and the outer peripheral wall on the upper side of the furnace body 10 is formed of a refractory structure such as a refractory brick. 13
The boundary between the water cooling jacket 12 and the fire wall 13 may be partially overlapped so that the water cooling jacket overlaps the outside.
In the embodiment shown in FIG. 1, the water cooling jacket 12 is not provided around the grate 14a, but the water cooling jacket 12 may also be provided in this portion.
The water cooling jacket 12 is configured such that cooling water circulates along the outer periphery of the primary combustion chamber 10A.
For example, a water cooling layer is formed with the steel plates 12a and 12b.
In the upper part of the water cooling jacket 12, there is provided an evaporation chamber 20 in which the cooling water Wo is stored and the upper part is a steam chamber.
Further, another part of the water cooling jacket 12, for example, a part of the furnace wall opposite to the evaporation chamber 20 and a water storage tank (cooling water tank) 30 are connected by a supply pipe 31.
In this embodiment, the water level height 30a of the water storage tank 30 and the water level height 20c of the evaporation chamber 20 are adjusted, and when the water level of the evaporation chamber 20 becomes higher than a predetermined level, the overflow return to the water storage tank 30 side via the overflow pipe 20b. It is supposed to be.
In this case, a check valve is provided in the overflow pipe 20b.
The upper space of the evaporation chamber 20 and the steam separator 21 are connected by a steam pipe 20a.
The air component separated by the steam separator 21 is discharged from the discharge port 21b, and the condensed cooling water is returned to the water storage tank 30 through the condensate pipe 21a.
Water is supplied to the water storage tank 30 by a supply pipe 32 via a water level gauge 33.
If it does in this way, it will naturally circulate in the water cooling jacket 12 by adjusting the height of the evaporation chamber 20 and the water storage tank 30.
A circulation pump may be used to make the water flow in the water cooling jacket 12 uniform.
As the steam-water separator, various steam-water separators such as a commercially available cyclone separator and a spiral flow type can be used.

DESCRIPTION OF SYMBOLS 10 Furnace main part 10A Primary combustion chamber 10B Secondary combustion chamber 11 Furnace bottom 12 Water cooling jacket 13 Fireproof wall 14 Pusher device 14a Grate 20 Evaporation chamber 20a Evaporation pipe 20b Overflow pipe 21 Steam-water separator 21a Condensate pipe 30 Water storage tank 31 Supply Pipe 32 Supply pipe 33 Water level gauge 100 Incinerator Wo Cooling water

Claims (4)

An incinerator having a primary combustion chamber and a secondary combustion chamber,
Forming a water cooling jacket on the furnace wall on the primary combustion chamber side;
An incinerator characterized in that the secondary combustion chamber side furnace wall is formed of a refractory structure. The water cooling jacket is connected to a water storage tank for storing cooling water, and an evaporation chamber,
The evaporation chamber has two systems: an air / water separation system connected to a water storage tank via an air / water separator and an overflow system that returns to the water storage tank when the water level in the evaporation chamber exceeds a predetermined level. The incinerator according to claim 1.   An incinerator characterized in that the furnace wall on the primary combustion side is remodeled to the water-cooled jacket system according to claim 1 or 2 among the furnace walls of an existing incinerator, the furnace wall of which is generally composed of a refractory structure. Remodeling method.   The method for remodeling an incinerator according to claim 3, wherein the incinerator is a stoker type incinerator or a kiln type incinerator.

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