JPH09280520A - Stoker furnace for burning article to be burned such as refuse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the cost by making a large sized furnace compact by improving stirring force for refuse and ash on a stoker. SOLUTION: This stoker furnace for burning an article to be burned is adapted such that drying and burning are performed supplying the article such as refuse onto a stoker 6 composed of a fixed fire grate and a movable fire grate from a feed table 5. In the stoker furnace, a back inclination angle of the fire grates provided on the stoker 6 extending from a final end side of the feed table 5 to a discharge hole for the burned article are directed upward by 30 to 50 degree in the direction of conveyance of the article, and the number of steps of the stoker 6 is set to be one, and further a mounting angle of the stoker 6 is directed upward in the direction of conveyance of the article.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stoker furnace for burning incineration of wastes, solid fuel, sludge and the like, which is applied to thermal recycling, and particularly to a slant of a predetermined angle in the direction of transporting waste incineration. The present invention relates to a stoker furnace for burning incineration objects such as garbage having a grate.

[0002]

2. Description of the Related Art Combustion equipment of a refuse incinerator includes a stoker type, a fluidized bed type, a rotary furnace type, etc., and is selected depending on the quality of the refuse, the scale of the incinerator, and the like. As for the stoker type, various types have been devised for the purpose of efficiently incinerating a large amount of dust without selecting it. For example, the actual exploitation 57-127129
In the issue, the stoker is configured in a stepwise manner so that each function of drying, burning, and post-burning can be achieved.

The structure of the prior art will be described with reference to FIG. 21. Reference numeral 17 is a dust supply device, in which a feed table 5 is installed below the dust input hopper 1 and the input chute 2.
Reciprocating feeder 3 on the table makes grate 7 trash 1
Supply 1 The stoker 6 is installed on the downstream side of the dust supply device 17. The stoker 6 is dried and burned from the upstream side.
The post-combustion stokers 6 are arranged in a stepwise manner, and the head difference between the stokers 6 is the same as the height of the feed table 5,
It is set to 100 ± 300 mm.

As shown in FIG. 22, each stoker has a step-like shape in which fixed grate stages 16 and moving grate stages 15 are alternately arranged, and each moving grate row for each stage is connected via a connecting rod 9A. It is driven by one hydraulic cylinder 9. Further, the air box 10 of the primary air 13 for combustion for each stage of the stoker is constituted by one for each stage. The operation element of the stoker 6 is operated by only one control element for each stage, and the combustion primary air amount control 1 series, the combustion air temperature control 1 series, the moving grate 1
It is equipped with a series of waste agitation control systems by 5 reciprocating motions. The installation angle of the stoker 6 is 0 °, the inclination angle of the rear surface of the grate relative to the surface of the stoker 6 is about 20 ° (the inclination angle of the rear surface of the grate relative to the horizontal plane), and the moving grate 15
The stroke is set to about 450 ± 50 mm.

In such a conventional stoker furnace, in the case of municipal waste combustion, the bulk specific gravity is 0.1 to 0.3 t /
When about ³ m ³ of waste is supplied to the charging hopper 1, the waste is compacted in the chute 2 and compressed to a bulk specific gravity of about 0.4 t / m ³ . The dust pushed out onto the feed table 5 is 100 to 30 strokes per stroke by the reciprocating feeder 3.
It is cut out by 0 mm and supplied onto the stoker 6.
Then, the waste 11 supplied onto the stoker 6 is agitated and mixed by the reciprocating motion of the grate 7 while the waste is dried and burned. When the waste falls on the steps of the feed table and the stoker, the waste is crushed and inverted. . Drying / combustion by contact between dust and high temperature primary air for combustion (50-280 ° C), drying / combustion of dust by radiant heat from flame (900-1200 ° C), stirring of dust when moving grate 15 advances It is dried and burned by crushing and reversing waste.

[0006]

However, in the above-mentioned conventional one control system per one stage, it is necessary to change the set value of each control system in order to maintain the optimum combustion condition when there is a sudden change in dust quality. There was a time delay before returning to the combustion state. Especially when throwing in large lumps and high-calorie waste,
The dust layer under the feed table and under the stoker step becomes thin, the grate surface is exposed to flames, spalling,
The grate surface was sometimes thermally damaged by thermal shock.
In addition, the dryness and gasification of the dust in the thin portion of the dust layer progresses and blow-through occurs, which temporarily causes excess air in this portion,
Combustion is delayed due to lack of air in other parts, which affects the combustion per stage of the stoker, changes in exhaust gas properties, deterioration of incinerated ash quality, and in the case of an incinerator with a boiler, fluctuations in boiler evaporation amount. There was an effect such as an increase.

In order to avoid these influences, it is preferable that the time until the optimum combustion state is restored after the change of the combustion field is short. However, in the conventional stoker furnace, the change in the combustion field is accompanied by the change. The recovery time of the lie took about 10 minutes or more, and the recovery time sometimes took 30 minutes or more when the fluctuation was large.

[0008] The average LHV of general waste discharged from cities accompanying the recent increase in the calorie content of waste is 2,000, which is double the 1,000 kcal / kg in the 1960s.
The maximum planned waste quality of municipal solid waste incinerators has risen to about kcal / kg, and some of them exceed 3,000 kcal / kg. Also, some RDFs that use waste as fuel have LHVs of 3,000 to 5,000 kcal / kg,
When such flammable waste is burned in a stoker furnace, the moisture in the waste is low and the drying, gasification, and ignition of the waste are fast, so the flame spreads quickly and the volume reduction rate due to the combustion of the waste is high. Is quick and blow through easily occurs. In the conventional stoker, the agitation power of dust and ash was not sufficient and blow-through occurred, resulting in fluctuations in combustion, fluctuations in the amount of exhaust gas and fluctuations in the amount of harmful substances contained. For this reason, in a stoker that supports high-calorie waste, the waste is stirred and smoothed immediately after it is put into the stoker from the feed table, the stirring frequency is increased during drying and burning, and the strong stirring force prevents blow-through. It is necessary to ensure stable combustion and prevent damage to the grate. By improving the stirring power of the grate, even if the dust on the stoker is transported at a speed equivalent to the flame propagation speed, if the dust can be completely burned within a certain moving distance, the residence time of the dust on the stoker will be short. Can be an efficient and compact incinerator.

Furthermore, the guidelines for prevention of dioxins generation, etc., issued by the Ministry of Health and Welfare in December 1990, show strict standards for all newly installed continuous reactors. It is also being considered to make it equal to the regulation value in Europe and the like, and in order to always operate the incinerator under ideal conditions that clear this regulation value, it is essential to maintain optimum combustion conditions. In addition, when considering the strict slag elution standards such as the existing soil environmental standards by reducing the volume of the incinerated ash discharged from the stoker by complete melting and reusing the molten slag to aggregate, etc., In order to always obtain stable slag properties, it is desirable that the properties of the incineration ash that is the raw material be stable,
For that purpose, it is necessary to maintain the optimum combustion conditions of the waste on the stoker.

Further, in the case of an incinerator equipped with a boiler, it is also required to increase the boiler efficiency as the steam temperature and pressure of the boiler are increased in order to improve the energy recovery rate from the waste by thermal recycling. Fluctuations in boiler evaporation due to stable combustion and stable exhaust gas temperature and temperature ± 1
It is required to be about 0% to ± 5%.

[0011] Therefore, the stoker furnace, which is the main source of thermal recycling that uses less than 50 million tons of general waste in a sanitary volume by incineration and uses the residual heat of exhaust gas, has a daily waste incineration amount of 300 ton / It is possible to construct a large-scale reactor that exceeds the standard, and it is a social responsibility to improve its performance. Specifically, it is required to solve the following problems.

1. Cost reduction by compacting a large furnace by improving the stirring power of dust and ash on the stoker 1. Prevention of grate damage when burning high-calorie waste 3. 3. Preventing clinker from sticking to the inner wall of the furnace when burning high-calorie waste. 4. Reduction of harmful substances contained in the exhaust gas at the incinerator outlet. Extending the life of the grate by preventing dust from getting into the grate 6. 6. Interconnection of incinerator and ash melting furnace system 7. Increasing the temperature and pressure of the boiler that uses the residual heat of the incinerator The basis for achieving the above important mission is to improve the stirring power of the stoker, which is the basic aim of the present invention.

[0013]

According to the first aspect of the present invention,
In a stoker furnace for burning incinerated materials that performs incineration of incinerated materials while supplying incinerated materials such as refuse from a feed table on a stoker consisting of a fixed grate and a moving grate, incineration after burning from the end side of the feed table It is characterized in that the rear surface of the grate provided on the stoker reaching the material discharge port is arranged so that its back surface inclination angle is upward by 30 to 50 ° in the conveying direction of the incineration object. Therefore, as will be described in detail later, in the present invention, since the back inclination angle of the grate is set to a steep slope equal to or more than the repose angle of ash, the combustion ash in the vicinity of the stoker and the unburned ash above Combustion waste can be mixed efficiently. The upper limit of the rear-face tilt angle of the grate is set to 50 ° because if it is set to this angle or more, the stroke of the grate becomes short and a predetermined conveying force cannot be obtained.

According to the second aspect of the invention, the number of stages of the stoker is set to one. In the prior art, as disclosed in FIG. 21, in order to cope with the increase in size, the steps are formed in three steps. However, if the steps are formed,
It is disadvantageous in terms of structure that a joint portion between the steps must be provided separately, but according to the present invention, it is only necessary to add an additional row of stokers and there is no step in the height direction. A compact structure is possible. Also, in the conventional technology, large lumps,
When high-calorie waste is thrown in, the waste layer under the step of the stoker becomes thin, heat damage to the surface of the grate, and drying and gasification of the waste in the thin part of the dust layer occur, causing blow-through. The air becomes excessive, and the combustion is delayed due to lack of air in other parts, affecting the combustion of the stoker,
Although there were changes in the properties of the exhaust gas, deterioration of the incineration ash quality, etc., this is not the case in the present invention.

According to a third aspect of the present invention, there is provided a stoker furnace for burning an incineration object, which performs dry combustion while supplying an incineration object such as dust from a feed table onto a stoker consisting of a fixed grate and a moving grate, Set the number of stoker stages from the stoker inlet side to the outlet end from the end side of the feed table to the incinerator discharge port after combustion to one, and set the stoker installation angle upward in the conveyance direction of the incinerated matter. It is characterized by being placed in. According to this invention, in addition to the effect of claim 2, particularly when the number of stages of the stoker is set to one, by setting the stoker installation angle upward by about 10 °, a sufficient convection time of the burned material is secured. Can be done and more complete combustion is possible.

According to a fourth aspect of the present invention, the stoker furnace for burning an incinerated material according to the first, second or third aspect is specified, and a protrusion is provided at a tip of a grate (particularly, a moving grate) of the stoker. It is configured so that the incineration material can be transported to the next upper surface of the grate (fixed grate) after overcoming. By providing the protrusions, ash and dust can be efficiently mixed due to the behavior of the grate pushing up and returning.

A fifth aspect of the present invention further specifies the stoker furnace for burning an incineration object according to the first, second or third aspect, wherein the grate group of the stoker has a grate provided with a projection at its tip (particularly A moving grate) and a grate without a protrusion (particularly a moving grate) are alternately arranged in the left-right direction, and the incineration object can be transported while causing a difference in the pushing force depending on the presence or absence of the protrusion. . According to this invention, mixing and diffusion in the left and right directions occur, and effective mixing can be achieved. In addition, when the upper limit of the inclination angle of the back surface of the grate is set to 50 °, the stroke of the moving grate becomes short. Therefore, when the moving grate is stroked so as not to exceed the tip of the fixed grate, the angle becomes large. The protrusion cannot be made large, and the shape of the protrusion becomes one mountain. However, if the lower limit of the tilt angle of the back of the grate is set to 30 °, the stroke of the moving grate can be lengthened, so that the projection shape can be made large, and the projection shape has two peaks,
It can also be a long mountain with a flat top. At this time, since the shape of the surface of the burned material is a projection of the shape of the stoker part, the larger the number of peaks, the smoother the surface becomes. The larger the projections and depressions on the surface, the more uneven the mixing tends to be. However, such a problem can be solved by adopting the above configuration.

The invention according to claim 6 is characterized in that the wind box arranged below the grate group constituting the stoker is divided into a plurality of pieces along the incineration object conveying direction. As a result, even if the stoker is constructed in a single-stage type, the functions of drying, burning, and post-burning can be achieved.

The invention according to claim 7 specifies the stoker furnace for burning an incineration object according to claim 1, 2 or 3,
An independent grate driving means is provided for each wind box. As a result, the above effect is further enhanced.

Next, the effect obtained by the strong stirring force for the dust and ash on the grate by the reciprocating grate of the stoker obtained in the present invention will be described in detail. The strong stirring force for dust and ash on the grate by the reciprocating grate of the stoker according to the present invention according to claim 1 is obtained by utilizing the slip angle due to the weight of the dust and the repose angle of the ash. To do. The slip angle due to the weight of the garbage and the angle of repose of ash are 30 to 35.
°. The conventional stoker furnace has a stoker installation angle of 0.
The angle of inclination of the grate back surface with respect to the stoker surface was about 20 °. In other words, the inclination angle of the back of the grate (= installation angle of the stoker + inclination angle of the grate) with respect to the horizontal plane is 20 ° or less, and it is more inclined than the slip angle due to the weight of the dust and the repose angle of ash, which is 30 to 35 °. When the grate was slowly reciprocated, the dust and ash accumulated on the grate moved only the amount of reciprocation of the grate.

In the present invention, the inclination angle of the rear surface of the grate is set to 30.
The feature is that the slope is steep at about 35 ° or even 40 °. That is, the inclination angle of the rear surface of the grate (= installation angle of stoker + inclination angle of the grate) is steeper than the repose angle of the incineration ash accumulated on the upper part of the grate with respect to the horizontal plane, which is 30 to 35 °, and the weight of the dust itself. 30-35 which is the slip angle due to
The slope is steeper than. When the moving grate is reciprocated under these conditions, the ash accumulated on the grate is pushed up and the angle of repose is disturbed and diffuses forward, backward, left and right, and the dust on the upper layer of ash is also diffused and mixed as it is involved in the diffusion of ash. To do. This stirring force is 1.5 ~ by attaching a protrusion to the tip of the grate.
It is doubled.

If a protrusion is attached to the tip of the grate, the dust and ash can be more effectively pushed up on the back side of the fixed grate when moving forward, and the return dust and ash can be pushed up on the front side of the fixed grate when moving backward. The push-up is effectively performed, and the mixing by drawing in the front side of the moving grate is also more effectively performed. Furthermore, by arranging rows with and without protrusions side by side alternately, due to the difference in the thrust force due to the presence or absence of protrusions, the rows of dust and ash that are pushed up on the back side of the fixed grate during forward movement will have rows with protrusions. Diffuses in the left-right direction toward the empty row, and when moving backward, the dust and ash pushed up on the front side of the fixed grate spreads in the left-right direction from the row with the projection to the empty row and the moving grate. Due to the pulling in to the front side, dust and ash are diffused from the row without protrusions to the row with left and right directions.

Therefore, according to the present invention, the inclination of the rear surface of the grate is equal to or greater than the repose angle of ash, and the ash avalanche phenomenon can be effectively performed, and the dust supplied from the feeder is moved up and down by the reciprocating motion of the moving grate. While mixing and mixing three-dimensionally in the front-rear and left-right directions, it is possible to even out to an appropriate dust layer thickness. While moving waste from the upstream side of the stoker to the downstream side by the reciprocating movement of the grate, the waste is dried, pyrolyzed, gasified and burned by using air supplied from the air box under the stoker.

At this time, as in the third aspect of the present invention, the stalker installation angle is inclined upward in the direction of the dust flow, so that the residence time of the dust can be secured for a long time and sufficient stirring and mixing can be performed. be able to. The residual distribution after burning the waste on the stoker is discharged from the rear end of the stoker by the reciprocating motion of the moving grate.

Further, according to the present invention, the refuse on the stoker promotes heat transport, mass transfer, and phenomenon / reaction in the course of its treatment, thereby improving the efficiency of the treatment. That is, by promoting three-dimensional agitation / mixing and blowing uniform air or the like through the grate, complete combustion of dust on the stoker can be achieved and the furnace can be made compact. In this case, drying, pyrolysis, gasification and combustion of waste on the stoker
In order to maximize the treatment efficiency in each process of post-combustion and make the stoker as compact as possible, control the dust layer thickness and ash layer thickness and agitate the heat source according to the volume reduction of dust in each process. Need to be promoted. For this reason, it is preferable that the air box under the stoker is divided into a plurality of pieces in the direction of dust flow, and each of the air boxes is provided with an independent grate drive system.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be exemplarily described in detail below with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, and are merely illustrative examples. Only. The basic configuration of the embodiment of the present invention will be described with reference to FIGS. 1 and 16. Reference numeral 17 denotes a dust supply device, which is provided with a feed table 5 below the dust input hopper 1 and the input chute 2. The trash 11 is supplied to the grate 7 by the reciprocating feeder 3. The structure of the dust supply device is
It is as shown in Table 1.

That is, the number of stages of the reciprocating feeder is 1 to 6
Step, reciprocating feeder stroke is 0 to 2,000 m
m (normal operation: about 100 to 300 mm), the driving method of the reciprocating feeder is a low speed (0 mm) represented by a hydraulic cylinder, a hydraulic motor, an electric cylinder, an electric linear motor, or the like.
Smooth driving can be performed with a driving machine under high output conditions (stepless or stepwise variable speed up to 100 mm / sec).・ The dimensions of the reciprocating feeder are height… 100 to 300 mmH width… 0.5 to 200 mW / unit (integral type or split type) ・ Installation angle of the feed table is 0 ° (horizontal) to 20 °
(Upward) ・ Feed table height is 0 to 2,000 mmH ・ Reciprocating feeder operation ON / OFF by manual, automatic, remote operation, dust combustion control, etc.
Performs operations such as OFF operation and continuously variable speed. -Feeder tip shape The reciprocating feeder 3 is, for example, as shown in FIG.
The protrusion 031 may be provided on the front end of the feeder. Desirably, the type without a protrusion and the type with a protrusion are selectively used depending on the characteristics of dust and the like.

[0028]

[Table 1]

A stoker 6 is installed downstream of the dust supply device 17. The stoker 6 sets the number of stages of the stoker from the end side of the feed table 5 to the incinerator exhaust port 12A after combustion to the stoker inlet side to the outlet end, and sets the stoker installation angle to convey the incinerated substance. The fixed grate stages 16 and the moving grate stages 15 are alternately arranged so that they are directed upward by about 10 ° in the direction.

Further, the inclination angle of the grate is arranged so as to be upward by 20 to 30 ° in the conveying direction of the incineration object, and as a result, the rear inclination angle of the grate 7 is upward in the conveying direction by about 30 to 40 °. It may be arranged as follows. The stoker 6 of this embodiment supplies dust and the like onto the grate 7 by a reciprocating feeder on the feed table, and discharges the residual ash and the like after burning the dust on the grate 7 from the rear end of the stoker 6. -The installation angle of the stoker 6 is set to 0 ° (horizontal) to 20 ° (upward), preferably 10 °.・ The grate inclination angle to the surface of the stoker is 20 ° to 40
(Upward), preferably 20 ° to 30 °.

Desirably, the inclination angle of the rear surface of the grate relative to the horizontal plane (= installation angle of the stoker 6 + inclination angle of the grate)
Is the angle of repose of the incineration ash accumulated on the upper part of the grate 30
The slope is steeper than ˜35 ° and is 30 to 50 °, preferably about 30 to 50 °.・ The width of the stoker 6 is 0.5 to 200 mW (integral type or split type, etc.) ・ The number of 7 steps of the grate is 4 to 30 steps per step of the stoker ・ The size of the grate 7… 100 to 300 mmH width… 0.01 ~ 200mW (integral type or split type) Stroke ... (fixed grate 16) ~ 2,000mm
(Movement grate 15) Moving grate 15 and fixed grate 16 are alternately arranged on the stoker 6.

Shape of tip of grate 7 ・ No protrusion type ... Inclination angle of front of grate 0 to 90 ° ・ With protrusion 8 ... Height of protrusion 0 to 300 mmH Width of protrusion 0.01 to 200 mW Inclination angle of front and rear of protrusion 0 to 90 ° Desirably, the projection tip angle is 55 ° or more. Projection row 1 to 5 rows Table 2 shows the construction of such a stoker.

[0033]

[Table 2]

As shown in FIG. 18, the stoker 6 has stokers 6 in which grate rows without protrusions 8 and grate rows with protrusions 8 are alternately arranged in the longitudinal direction in the flow direction of dust on the stoker 6. Compose the entire single-step surface.

The moving grate 15 is driven under a low speed (0 to 100 mm / sec stepless or stepwise variable speed) represented by a hydraulic cylinder, a hydraulic motor, an electric cylinder, an electric linear motor, or the like, under high output conditions. The machine can drive smoothly. The operation of the grate 15 is an ON / OFF operation, a continuously variable speed, or the like by manual, automatic, remote control, dust combustion control, or the like.

Although the stoker 6 of this embodiment is constructed in one stage, the drive cylinder and the like are constructed by being divided into 1 drive system to 15 drive system, and preferably, the wind box 10 below the grate 15.
It is advisable to attach an independent drive system to each section.
The wind box 10 supplies primary air for combustion, exhaust gas recirculation gas, oxygen-enriched air, single (pure) or mixed gas and steam for drying, pyrolysis / combustion, etc. from the lower part of the grate 7 into the furnace. The grate 7 is configured to be supplied through the side surface / front surface or the slits / holes or pores penetrating the grate 7.

The number of divisions of the wind box 10 is 1 to 15 along the carrying direction. Desirably, even when the stoker 6 is formed in a single stage, a plurality of wind boxes 10 are attached to dry, pyrolyze, and decompose. Air, etc. will be distributed according to each process such as gasification combustion, post combustion, etc. in the furnace. It should be noted that the wind box 10 may be either an integral type or a split type in the width direction.

The structure of the wind box 10 shown in FIG. 1 is shown in Table 3.

[0039]

[Table 3]

The group of grate 7 is divided into four by the wind box 10 arranged below the group of grate 7 along the conveying direction of the incinerated material, and the divided moving grate 15 is formed.
Each is configured to be driven by one hydraulic cylinder 9 via a connecting rod 9A.

Therefore, the operating elements of the stalker 66 are operated by operating only one control element for each wind box 10 unit. Therefore, since there are four wind boxes 10, the primary air amount control series for combustion, the combustion air There are four temperature control sequences and four dust agitation control sequences due to the reciprocating motion of the moving grate 157, respectively.

According to this embodiment, it is possible to obtain stable steady combustion in which irregular fluctuations are suppressed. For example, the average thickness of the dust and ash layers formed on the stoker 6 is 50.
It is about 1,500 mmt. The residence time of dust, ash, etc. on the stoker 6 is about 10 to 150 minutes on average. In order to maximize the treatment efficiency in each process of drying, pyrolysis, gasification combustion, and post-combustion of waste on the stoker 6, and make the stoker 6 as compact as possible, reduce the volume of waste in each process. It is necessary to control the combined dust layer thickness and ash layer thickness and promote stirring of the heat source. For this reason, as shown in FIG. 1, the wind box 10 under the stoker 6 is divided into a plurality of pieces in the flow direction of dust, and each wind box 10 is provided with an independent grate 15, 16 drive system. Good.

The products to be treated used in this embodiment are wastes typified by municipal waste, industrial wastes, RDF (Refu
se Derived Fuel) such as solid fuels and the like, products such as sludge and sewage that are mixed with the above-mentioned substances to be treated, and the like components such as paper, plastic, wood, rubber, and other raw materials, LHV = 0 to 12,000 kcal / kg for materials, semi-finished products, finished products, recycled products, waste products, etc.
Even those with a low heating value can be incinerated sufficiently. Then, the method of treating the refuse and the like on the stoker 6 is as follows. After the refuse and the like are dried, the volatile components in the combustible components are thermally decomposed and then gasified and combusted, and the fixed carbon components in the combustible portion are solid-combusted. ,
Discharge residual ash, etc.

In Table 4, the inclination angle of the grate 7 is 30 ° upward,
The grate 7 shows a cross-sectional shape of the grate 7 having a back surface inclination angle of 40 ° and corresponds to FIGS. 2 to 7.

[0045]

[Table 4]

FIG. 2 shows a moving grate 15 and a fixed grate 16.
Each of them has a triangular projection 8 at the tip, and the detailed shape thereof is shown in FIGS. 3 and 17. In this embodiment, the moving grate 15 strokes is 360 m.
When the height of the grate is 130 mm, the shape of the projection 8 is such that the starting end of the projection 8 is set at 90 mm from the tip of the grate, the height of the projection 8 is 40 mm, the tip angle of the projection 8 is 57 °, and the front surface is Tilt angle of 52 °, rear tilt angle of 5 °
Is set to Figure 4 shows the types of tip projections 8
The shapes of large right triangles, trapezoids, rounds having a semicircular cross section, and chamfered projections 8 are disclosed.

FIGS. 5 to 7 are side views of a grate array without tip projections 8 of the stoker furnace applied to FIG. 1, and FIG. 5 shows the tip corners of the grate cut substantially horizontally. The angle of inclination of the front end of the grate is set to 52 °, and the angle of inclination of the cut portion is set to 85 °. The cut height is set to (130-75) mm. Fig. 6 shows the tip corner of the grate slightly chamfered into an R shape, and Fig. 7 shows the grate with a large curvature formed into an R shape. The height is set to 130 mm.

The grate with the tip projection 8 shown in FIGS. 3 to 4 and the grate 7 without the tip projection 8 shown in FIGS. It is possible to form a stoker furnace having seven rows of grate in which the no-protrusions 8 and the no-protrusions 8 of the stoker furnace shown are alternately arranged. In the figure, (A) is a plan view and (B) is a side view.

Table 5 shows the cross-sectional shape of the grate 7 with a grate inclination angle of 20 ° upward and a grate back inclination angle of 30 °.
This corresponds to FIGS. 8 to 15.

[0050]

[Table 5]

FIG. 8 shows a moving grate 15 and a fixed grate 16.
Both of them have a bimodal protrusion 8 at the tip,
In this embodiment, when the height of the grate is set to 130 mm, the shape of the protrusions 8 is set such that the starting point of the formation of the two protrusions 8 is 150 mm from the tip of the grate, and the height of the protrusions 8 is 40 mm and the protrusions 8 are 8 mm. Tip angle is 75 °, front tilt angle is 4
2 °, 60 °, and the rear surface inclination angle is set to 15 °.
Fig. 9 shows that the starting point for forming the two protrusions 8 is 156m from the tip of the grate.
The height of the protrusion 8 is set to 40 mm, the tip angle of the protrusion 8 is set to 74 °, the front surface inclination angle is set to 42 °, and the rear surface inclination angle is set to 32 °.

10 to 12 show the types of the shape of the tip projections 8. FIG. 10 shows the shapes of the large trapezoidal shape, the small trapezoidal shape, and the chamfered trapezoidal shape, and FIG. 11 shows the horizontal trapezoidal shape.
The shape of each protrusion 8 of the forward tilted trapezoidal type and the front round type is further shown in FIG.
2 is a large two-mountain type that combines multiple trapezoids, a small two-mountain type,
The shapes of the respective protrusions 8 of the two round-shaped mountains are disclosed. FIG.
15 is a side view of one of the grate rows without the tip projections 8 of the stoker furnace, and FIG. 13 is a view in which the tip corner portion of the grate is cut slightly in the forward tilt direction. The inclination angle is set to 42 °, and the inclination angle of the cut portion is set to 75 °. The cut height is set to (130-75) mm. FIG. 14 is a view in which the tip corner portion of the grate 7 is chamfered slightly in an R shape, and FIG. 15 is formed in an R shape with a large curvature. The tip front end inclination angle of the grate 7 is 42 ° The front end height is set to 130 mm.

FIG. 19 is an overall assembly view of a stoker furnace according to another embodiment of the present invention different from that of FIG. 1. To explain the difference from the embodiment of FIG. 1, the reciprocating feeder 3 has two upper and lower stages. The stoker 6 has a single stage, but the wind box 1
0 is divided into five parts in the carrying direction. The drive cylinder 9 is not mounted as an independent drive system for each wind box 10, but a drive system is provided for each of the plurality of wind boxes 10.

FIG. 20 shows another embodiment in which the stoker 6 has a two-stage structure. The stoker 6 extending from the end side of the feed table 5 to the incinerated matter discharge port 12A after combustion has a two-stage structure and a grate 7 is provided. Is arranged so that the back inclination angle thereof is 30 to 50 ° upward in the conveying direction of the incineration object. still,
In the wind box 10, the stoker 6 on the first stage side is divided into two and two wind boxes 10 are provided, and one stow box 1 is provided on the stoker 6 on the second stage side.
0 is provided for each. The drive cylinder 9 is attached as an independent drive system for each stage.

[0055]

As described above, according to the present invention, it is possible to improve the grate burning rate (waste incineration amount to 10,000 t / day / around furnace), and at the same time, use a strong stirring power of dust and ash
Achieved 50kg / m ² or more (400 for high-calorie waste
kg / m ² h or more is also possible). Further, according to the present invention, it is possible to achieve 1.5 to 2 times or more of the conventional one by devising the inclination angle of the rear surface of the grate and the shape of the projection 8 on the tip of the grate. Further, according to the present invention, even when the high carote refuse is burned, there is no damage to the grate by securing an appropriate dust layer and ash layer, and uniform combustion in the furnace eliminates clinker adhesion.

[Brief description of drawings]

FIG. 1 is an overall assembly view (longitudinal sectional view / grate back surface inclination angle of 40 °) of a stoker furnace according to a first embodiment of the present invention.

FIG. 2 is a first assembly diagram (longitudinal sectional view / grate rear surface inclination angle 40) of the stoker furnace drive system applied to FIG.
°).

FIG. 3 is a side view (grate back surface inclination angle of 40 °) of a grate array with tip projections of the stoker furnace applied to FIG. 2;

FIG. 4 is a side view (grate back surface tilt angle of 40 °) showing various grate tip projection shapes of the stoker furnace applied to FIG. 2;

5 shows a side view (grate back surface inclination angle of 40 °) of one of the grate rows without tip projections of the stoker furnace applied to FIG. 1. FIG.

FIG. 6 shows a side surface (grate back surface inclination angle of 40 °) of a grate array without tip projections (square type) of the stoker furnace applied to FIG. 1.

FIG. 7 is a side view of a grate array (round type) without tip projections of the stoker furnace applied to FIG. 1 (grate back surface inclination angle of 40 °).
Is shown.

FIG. 8 is a side view of a grate array with tip projections of a stoker furnace according to another embodiment of the present invention (grate back surface inclination angle of 30 °).

FIG. 9 is a side view of a grate array with tip projections of a stoker furnace according to another embodiment of the present invention (grate back surface inclination angle of 30 °).

FIG. 10 is a side view of various grate tip projection shapes of a stoker furnace according to another embodiment of the present invention (grate back surface inclination angle 30).
°).

FIG. 11 is a side view of various grate tip projection shapes of a stoker furnace according to another embodiment of the present invention (grate back surface inclination angle 30).
°).

FIG. 12 is a side view of various grate tip projection shapes of a stoker furnace according to another embodiment of the present invention (grate back surface inclination angle 30).
°).

FIG. 13 is a side view of a grate array without tip projections of a stoker furnace according to another embodiment of the present invention (grate back surface tilt angle 30).
°).

FIG. 14 is a side view (grate back surface inclination angle of 30 °) of a grate array without tip protrusions (square type) of a stoker furnace according to another embodiment of the present invention.

FIG. 15 shows a side view (grate back surface inclination angle of 30 °) of a grate row without tip protrusions (round shape) of a stoker furnace according to another embodiment of the present invention.

FIG. 16 is an overall assembly view (bird's eye view) of the stoker furnace according to the embodiment of the present invention, which corresponds to FIG. 1.

FIG. 17 is a bird's-eye view of a grate with a tip projection corresponding to FIG.

FIG. 18 shows a plan view (A) and a side view (B) of a grate row in which the tipless projection and the tipless projection are alternately arranged in the stoker furnace according to the embodiment of the present invention.

FIG. 19 is an overall assembly view (longitudinal sectional view) of a stoker furnace according to another embodiment of the present invention, which is different from FIG. 1.

FIG. 20 shows a plan view (A) and a side view (B) of a grate array in which a tipless projection and a tipless projection are alternately arranged in a stoker furnace according to an embodiment of the present invention.

FIG. 21 is an overall assembly view (longitudinal sectional view / grate back surface inclination angle of 20 °) of a conventional stoker furnace.

FIG. 22 is an assembly view (longitudinal sectional view / grate back surface inclination angle of 20 °) of the conventional stoker furnace grate drive system.

[Explanation of symbols]

 1 Input hopper 2 Input chute 3 Feeder 4 Feeder drive cylinder 5 Feed table 6 Stalker 8 Grate tip projection 9 Grate drive cylinder (hydraulic cylinder) 10 Grate downwind box 11 Garbage 12 Incinerated ash (residual ash) 13 Primary combustion Air 14 Exhaust gas 15 Moving grate 16 Fixed grate 17 Dust supply device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuki Nishizuka 1-8-8 Sachiura, Kanazawa-ku, Yokohama City Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Mitsuru Shimizu 1-8-1 Sukiura, Kanazawa-ku, Yokohama Mitsubishi Heavy Industries Yokohama Research Center

Claims (7)

[Claims] 1. A stoker furnace for burning an incineration object, which performs dry combustion while supplying an incineration object such as dust on a stoker consisting of a fixed grate and a moving grate from above a feed table, from the end side of the feed table. The incineration of garbage, etc., characterized in that the rear tilt angle of the grate provided on the stoker reaching the incinerator discharge port after combustion is arranged so as to be upward by 30 to 50 ° in the conveying direction of the incinerator. A stoker furnace for burning materials. 2. The stoker furnace for burning incineration materials such as refuse according to claim 1, wherein the number of stages of the stoker is set to one. 3. A stoker furnace for burning an incineration object, which performs dry combustion while supplying an incineration object such as dust on a stoker consisting of a fixed grate and a moving grate from above a feed table, from the end side of the feed table. Characterized by setting the number of stages of the stoker from the inlet side of the stoker reaching the outlet of the incinerated material after combustion to the outlet end to one, and setting the stoker installation angle upward in the conveying direction of the incinerated material. A stoker furnace for burning incinerated materials such as garbage. 4. The incinerator for burning incineration according to claim 1, 2 or 3, wherein a protrusion is provided at a tip of the grate of the stoker and the incinerator can be transported to the upper surface of the next grate over the protrusion. Stoker furnace. 5. The stoker grate group comprises a grate having a projection at the tip and a grate having no projection alternately arranged in the left-right direction, and provides a difference in thrust force depending on the presence or absence of the projection. The stoker furnace for burning an incineration object according to claim 1, 2 or 3, wherein the incineration object can be transported. 6. The incineration of refuse or the like according to claim 2 or 3, characterized in that the wind box arranged below the grate group constituting the stoker is divided into a plurality of pieces along the conveyance direction of the incineration object. A stoker furnace for burning materials. 7. A stoker furnace for burning an incineration object according to claim 5, wherein an independent grate driving means is provided for each of the wind boxes.