JPH08240305A - Refuse incinerator - Google Patents

Abstract

PURPOSE: To provide a refuse incinerator keeping a grate from corroding extremely, by uniformly and quickly controlling a thickness of refuse to be heaped up at a combustion part in a conveying mechanism. CONSTITUTION: A refuse thickness-controlling mechanism 7 wherein a pathway 7b for a cooling medium is formed inside a cylindrical member of which the cross section is in ellipse shape, at the upstream side of a refuse combustion part B on a conveying mechanism 5, and the cylindrical member for adjusting a thickness of refuse to be heaped up by its outer surface is swingably arranged parallel to the cross direction of the conveying mechanism 5 and above the conveying mechanism 5, is formed in a refuse incinerator having the conveying mechanism 5 of a stocker type by which the refuse thrown-in is incineration- treated while being conveyed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dust incinerator having a stoker type transport mechanism for incinerating waste while transporting it.

[0002]

2. Description of the Related Art The above-mentioned stoker type transport mechanism 5 is shown in FIG.
As shown in FIG. 6, a plurality of rostruts 5a made of a rectangular casting are arranged alternately in the width direction along the movable frame 5b and the fixed frame 5c, as shown in FIG. The movable frame 5b is reciprocally moved in the carrying direction by a hydraulic drive mechanism (not shown) to relatively move the roster to carry the dust.

In recent years, since the amount of high-calorie dust has increased, it tends to burn easily and tends to burn at a high temperature. When the above-mentioned rostrut 5a is heated to a high temperature, corrosive gas such as hydrogen chloride generated from the burned dust causes a problem. Since it will be corroded, it is necessary to prevent the temperature rise of the rostrur in order to avoid extreme corrosion. Therefore, conventionally, the relative moving speed of the rostrut 5a by the hydraulic drive mechanism is adjusted so that the transport mechanism is The thickness of the accumulated dust in the combustion section of No. 5 was adjusted. In other words, when the temperature of the roster 5a rises, the transport speed of the dust on the upstream side of the burning portion of the dust accumulated on the upper portion of the transport mechanism 5 is increased, and the deposition thickness of the dust on the burning portion is increased. Thus, the temperature of the rustle 5a was reduced by such adjustment.
At this time, the supply amount of the primary combustion air supplied from the lower portion of the transport mechanism 5 is further increased to positively cool the roster 5a.

[0004]

However, the dust transported by the transport mechanism tends to be distributed thickly in the central portion of the transport mechanism and thinly in the peripheral portion, and further, even at the same transport speed, depending on the dust quality. Since the transport amount may be different,
It was extremely difficult to uniformly and quickly adjust the dust accumulation thickness in the combustion section by adjusting the transport speed.
In addition, there is a strong tendency that combustion unevenness occurs due to the above-mentioned non-uniform deposition thickness of dust and difference in dust quality, and combustion air blows out from the part where the dust thickness is thin, causing partial burnout of the rustles. It was An object of the present invention is to eliminate the above-mentioned conventional drawbacks, to uniformly and quickly adjust the dust accumulation thickness in the combustion section of the transport mechanism, and thereby to provide a dust incinerator that can avoid the extreme corrosion of a rostrul. It is in the point of providing.

[0005]

In order to achieve this object, the characteristic structure of the refuse incinerator according to the present invention is to adjust the dust accumulation thickness in the combustion section upstream of the dust combustion section in the transfer mechanism. The point is that a dust thickness adjustment mechanism is provided. In the dust thickness adjusting mechanism, a passage for a cooling medium is formed inside, and a cylindrical body for adjusting the dust accumulation thickness on the outer surface is arranged above the conveying mechanism along the width direction. It is preferable. It is preferable that the tubular body has an elliptical cross section and is attached so as to be swingable around an axis along the axial direction. It is preferable that the cooling medium is boiler water of a waste heat boiler that generates steam from combustion gas generated in the furnace.

[0006]

By the dust thickness adjusting mechanism, dust transported from the upstream side of the combustion section is transported to the combustion section whose thickness is limited. For example, when the roastle temperature in the combustion section rises, the thickness of dust is increased to promote a decrease in the rostle temperature. Since the dust thickness adjusting mechanism has a considerably high temperature, a cylindrical shape for adjusting the dust accumulation thickness on the outer surface while preventing damage due to heat by forming a cooling medium passage inside to cool the dust thickness adjusting mechanism. By disposing the body above the transport mechanism along the width direction, the thickness of dust can be adjusted uniformly along the width direction of the transport mechanism. The tubular body is formed in an elliptical cross section, and is attached so as to be swingable around an axis along the axial direction, so that the dust thickness can be easily adjusted by changing the swinging posture,
Moreover, the outer surface of the elliptical tubular body acts as a linear smooth guide plate to enhance the dust thickness regulating effect. The cooling medium introduced into the passage formed inside the tubular body is boiler water of a waste heat boiler that generates steam from the combustion gas generated in the furnace, so that the heat obtained by cooling is generated. It is effectively used for.

[0007]

According to the present invention, it is possible to provide a dust incinerator capable of avoiding the extreme corrosion of a losstle by uniformly and quickly adjusting the deposition thickness of dust in the combustion section of the transfer mechanism. Is now possible.

[0008]

EXAMPLES Examples will be described below. In the refuse incinerator, as shown in FIG. 3, the dust thrown in the hopper 3 is thrown into the combustion chamber 1 by the reciprocating drive of the pusher 2 provided under the hopper 3, and the ash burned in the combustion chamber 1 is put into the ash pit 4 It is configured to be collected. The combustion chamber 1 has a drying zone A for drying the dust and heating it to a temperature near the ignition point, a combustion zone B for burning the dried dust, and a post-combustion zone C for completely ashing the burned dust. Are arranged in a stepwise manner from the upper side to the lower side, and are provided with air supply means 8 for supplying combustion air from the lower side through the wind box 11. The dry zone A, the combustion zone B, and the post-combustion zone C are formed by arranging a plurality of rectangular rostruts 5a arranged in the width direction as shown in FIG. 5 and fixed to the movable frame 5b as shown in FIG. The frames 5c are alternately arranged along the transportation of the dust, and the movable frame 5b is reciprocated in the transportation direction by a hydraulic drive mechanism (not shown) to move the movable frame 5b back and forth along the transportation direction. The stoker-type transport mechanism 5 transports dust by moving the roster 5a relatively.

The combustion gas generated in the combustion chamber 1 is a combustion zone B
After being guided to the flue 6 formed in the upper space of the exhaust gas and subjected to heat exchange by the waste heat boiler 12 provided in the flue 6, dust and harmful gas were removed by the exhaust gas treatment facility 14 including an electric dust collector or the like. The waste heat boiler 1 is exhausted from the chimney 15 later.
The thermal energy extracted in the form of steam by 2 is supplied to the generator 13.

As shown in FIGS. 1 to 3, a dust thickness adjusting mechanism 7 for adjusting the dust deposit thickness in the burning portion of the transport mechanism 5, that is, upstream of the combustion zone B, is arranged.
Is provided. More specifically, the dust thickness adjusting mechanism 7 has a ceramic cylindrical body 7a having an elliptical cross section and having a passage 7b for a cooling medium formed therein. It is disposed on the left and right side walls so as to be swingable around a shaft core P along the shaft center direction by a hydraulic mechanism to adjust the dust accumulation thickness on the outer surface of the cylindrical body 7a. It is configured such that the dust accumulation thickness can be variably adjusted according to the posture. Part of the heat transfer tube of the waste heat boiler 12 is connected to the passage 7b via a side wall,
Boiler water is used as the cooling medium.

In other words, the large amount of dust carried from the dry zone A is detected by the thermocouple (not shown) as a temperature detecting means provided in the combustion section, when the temperature of the rostrum 5a is
The swinging posture of the tubular body 7a is adjusted so that the high temperature corrosion becomes lower than about 350 ° C., which is a problem due to corrosive gas such as hydrogen chloride generated by the incineration of dust, and the widthwise direction is uniform. The thickness of dust deposited on the combustion section is limited while maintaining the thickness.

Another embodiment will be described below. The dust thickness adjusting mechanism 7 is not limited to the position where it is installed upstream of the combustion zone B, and may be installed downstream of the drying zone A, for example. Further, in the previous embodiment, the description has been given of the case where the dry zone A, the combustion zone B, and the like are arranged through the step portion to configure the transport mechanism 5, but the transport mechanism 5 does not have the step portion and is linear. It may be configured. In the above embodiment, the case where the boiler water is used as the cooling medium has been described, but the present invention is not limited to this, and for example, air may be used for cooling. In this case, as shown in FIG. 4 (a), a plurality of air supply holes 7c are formed on the side surface of the cylindrical body 7a facing the dust, and the dust is burned through the air supply holes 7c. May be configured to accelerate combustion. Further, the sectional shape of the tubular body 7a is not limited to the elliptical shape, and may be a flatter shape. Furthermore,
As shown in FIG. 4B, the cross-sectional shape of the tubular body 7a may be a perfect circle. In this case, a plurality of cylindrical bodies 7a arranged side by side in a freely rotatable manner along the direction of transport of dust may be attached so that the position thereof can be adjusted in the vertical direction.

It should be noted that reference numerals are given in the claims for convenience of comparison with the drawings, but the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a side view of a main part.

FIG. 2 is a perspective view of a main part

[Fig. 3] Schematic configuration diagram of an incinerator

FIG. 4 is a perspective view of a main part showing another embodiment.

FIG. 5 is a perspective view of a main part

FIG. 6 is a side view of the main part.

[Explanation of symbols]

 5 Transport Mechanism 7 Dust Thickness Adjustment Mechanism 7a Cylindrical Body 7b Passage B Combustion Section

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display location F23H 11/02 ZAB F23H 11/02 ZAB

Claims (4)

[Claims] 1. A waste incinerator having a stoker type transfer mechanism (5) for incinerating while throwing in input dust, the upstream side of a dust combustion section (B) in the transfer mechanism (5). A dust incinerator having a dust thickness adjusting mechanism (7) for adjusting the dust accumulation thickness in the combustion section (B) on the side. 2. The dust thickness adjusting mechanism (7) has a passage (7b) for a cooling medium formed therein, and a cylindrical body (7a) for adjusting a dust deposition thickness on an outer surface of the transporting member. The refuse incinerator according to claim 1, which is arranged above the mechanism (5) along the width direction. 3. The refuse incinerator according to claim 2, wherein the tubular body (7a) has an elliptical cross section and is attached so as to be swingable about an axis along the axial direction. . 4. The waste incinerator according to claim 2 or 3, wherein the cooling medium is boiler water of a waste heat boiler (12) that produces steam from combustion gas generated in the furnace.