JP2955477B2 - Combustion air supply mechanism for garbage incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a wind box for supplying combustion air to dust on a stoker-type incineration zone for incineration while transporting inputted dust, below the incineration zone. Also, the present invention relates to a combustion air supply mechanism of a refuse incinerator provided with a blower mechanism for supplying combustion air upward from below the wind box.

[0002]

2. Description of the Related Art As shown in FIG. 7, a combustion air supply mechanism of this kind of incinerator uses a blower fan 7a to draw air sucked by a stoker type incineration treatment zone 5 through an air supply passage 7b. It provided the above has been configured to supply a combustion air from below the windbox 6b of flared, has been configured so as to be substantially uniformly supplied to the combustion air over the entire range of incineration zone 2 . Here, blower fan 7a
And the air supply path 7b constitute a blower mechanism 7.

[0003]

Generally, in the incineration zone, combustion is performed while shifting from gas combustion in which dust is gasified and burned due to high temperature to solid combustion in which carbonized dust is burned. Is maximum at the transition point from the gas combustion region to the solid combustion region, that is, at the burnout position . Therefore, there is a problem that the temperature of the incineration zone becomes abnormally high at the burn-out position , and the rustles constituting the incineration zone are easily corroded. In accordance with the combustion air supply mechanism of a conventional incinerator described above, in order is to substantially uniformly supplying combustion air to the entire range of incineration zone, because it is impossible to cool the locally grate is there. Moreover, it is the dust off burning during conveyance on incineration zone, to flow in many small portions of the resistance after the position outright burn air, since the cooling of the upstream side of the burnout position becomes difficult.

Further, downstream of the burn-off point where combustion is almost completed, air is wastedly supplied although combustion air is not so required, resulting in a decrease in furnace temperature. There is a problem that complete combustion in the next combustion region may be prevented. An object of the present invention is to solve the above-mentioned conventional problems .

[0005]

Means for Solving the Problems] characterizing feature of the incinerator according to the present invention for achieving this object, in the wind box, the windbox
Air distribution adjusting mechanism for adjusting the distribution of the amount of combustion air supplied from the inside of the wind box in the direction along the direction of transport of the refuse to the incineration zone. .

[0006] In this aspect, the grate temperature detection mechanism that detects a temperature at a plurality of locations across the transport direction of the rubber <br/> Mi of the incineration zone, the air based on the temperature detected by the grate temperature detection mechanism provided the air distribution control means for controlling the distribution adjustment mechanism, the air distribution control means, wherein
The incineration process is performed based on the temperature detected by the rostral temperature detection mechanism.
Determine the position of burnout of garbage in the
The supply of the combustion air downstream from the separated burnout position.
By reducing the supply distribution, the combustion air to the burnout position is reduced.
The air distribution to the first control state for increasing the air supply distribution.
Preferably it is configured to control the minute adjustment mechanism
No.

[0007] The air distribution control means, when the detected temperature of the burn-out position detected by the Rostor temperature detection mechanism is lower than the detected temperature on the upstream side,
It is preferable that the air distribution adjusting mechanism is controlled to a second control state in which the adjustment of the supply amount distribution of the combustion air is released from the first control state.

[0008] The air distribution adjusting mechanism may be constituted by a guide plate whose posture can be freely adjusted to adjust the distribution of the amount of combustion air supplied from below to above the wind box by the blowing mechanism. preferable.

[0009]

[Action] by the air distribution adjusting mechanism provided in the wind box, in order to focus supply the area in need of combustion air supplied to the windbox from the blower mechanism, relative to the direction along the conveying direction of the waste
The distribution of the supply amount of the combustion air in the wind box is adjusted.

[0010] Here, the temperature distribution in the conveying direction of the dust is detected by the rostral temperature detecting mechanism provided in the incineration zone to judge the combustion state of the dust, and the combustion air is intensively supplied based on the judgment result. When the air distribution adjusting means is controlled by the air distribution control means so as to mainly supply the combustion air to the area to be determined, the combustion air
Distribution can be determined.

More specifically, the air distribution control means determines a point indicating a maximum temperature from a temperature detected by the Rostor temperature detection mechanism as a burn-off position of the refuse in the incineration treatment zone, and at least determines the burn-off position. The air distribution adjusting mechanism is controlled to a first control state in which the supply amount distribution of the combustion air on the downstream side from the position is decreased and the supply amount distribution of the combustion air to the burn-out position is increased.

When the detected temperature at the burn-off position detected by the Rostor temperature detecting mechanism becomes lower than the detected temperature on the upstream side, the air distribution control means is caused by an excessive supply of combustion air. The air distribution is shifted from the first control state to the second control state in which the adjustment of the supply distribution of the combustion air is released from the first control state in order to avoid deterioration of the combustion state due to excessive cooling of the rostral at the burn-off position. It controls the adjustment mechanism.

The air distribution adjusting mechanism may be constituted by a guide plate whose posture can be freely adjusted to adjust the distribution of the amount of combustion air supplied from below to above the wind box by the blowing mechanism. Changing the attitude of the guide plate to change the flow of combustion air to change the combustion air in the wind box with respect to the direction along the garbage transport direction.
It regulates the distribution of qi supply .

[0014]

According to the combustion air supply mechanism of the refuse incinerator according to the present invention, an air distribution adjusting mechanism is provided so that the combustion air supplied from the blower mechanism to the wind box is supplied to a required area in the wind box. Since the supply can be performed in a focused manner, damage to the rostrum can be avoided, durability can be improved, and efficient combustion control can be achieved.

Here, the provision of the rostral temperature detecting mechanism enables the combustion state of the dust to be accurately determined, so that the distribution of the supply amount of the combustion air can be determined almost appropriately.

The burn-off position of the dust is determined from the temperature detected by the Rostor temperature detecting mechanism, and at least the supply amount of the combustion air downstream from the determined burn-off position is determined.
Min reduces the test of combustion air into the burnout position
By controlling the air distribution adjusting mechanism in the first control state for increasing the supply distribution , avoiding useless air supply from the burn-out position to the downstream side, and promoting cooling of the roaster at the burn-out position. Is now available.

The air distribution adjusting mechanism is controlled to change between the first control state and the second control state in which the adjustment of the distribution of the supply amount of combustion air is released, thereby stabilizing the combustion state. This enables efficient air supply control.

By using a guide plate which is adjustable in attitude to adjust the distribution of the amount of combustion air supplied from below to above the wind box by the blowing mechanism, the air distribution adjusting mechanism has a very simple structure. Can be configured.

[0019]

Embodiments will be described below. As shown in FIG. 1, the garbage incinerator includes a stoker-type incineration zone 2 for incinerating garbage put into a hopper 1 from a pit (not shown).
And an ash pit 3 for collecting ash generated in the incineration zone 2 and an exhaust gas treatment mechanism 4 for purifying exhaust gas generated by combustion, and a power generation mechanism 5 utilizing the heat of combustion of refuse.
And is configured.

The incineration zone 2 is composed of a drying zone A for drying the dust introduced by a hydraulically driven pusher 1a provided below the hopper 1, a combustion zone B for burning, and a post-combustion zone for ashing. C are arranged in cascade in a stepwise manner, and each of the treatment zones A, B, and C is formed along a transport direction along a transport direction with a fixed grate (not shown) and a movable grate (not shown). The dust is agitated and transported by alternately disposing the movable grate in a diagonal up and down direction by a hydraulic mechanism (not shown).

[0021] of the lower the incineration treatment zone 2, the incineration process
Wind boxes 6a, 6b, and 6c are provided as wind boxes 6 for supplying combustion air to the belt 2 from below, and the combustion air is directed upward from below the wind boxes 6a, 6b, and 6c. Is provided to each of them to constitute a combustion air supply mechanism. The blowing mechanism 7 includes:
It comprises a blower fan 7a for sucking outside air, and an air supply path 7b for guiding the sucked air to below the wind box 6.

The power generation mechanism 5 is provided with a waste heat boiler 5a on the downstream side of the flue 12 formed above the combustion zone B, and via a steam turbine 5b driven by steam generated by the waste heat boiler 5a. It is configured to generate power by the generator 5c.

The exhaust gas treatment mechanism 4 comprises an electric precipitator, a wet cleaning device and the like. After the dust and harmful gas are removed, the exhaust gas is exhausted from the chimney 11 through the white smoke prevention device 10.

A guide plate 8a for adjusting the flow of the combustion air supplied by the blower mechanism 7 is provided immediately below a portion of the combustion zone B from the center in the transport direction to the downstream side in the width direction of the combustion zone B. Is mounted so as to be swingable around the axis p along the axis, so that the direction of the dust
An air distribution adjusting mechanism 8 that adjusts the distribution of the supply amount of the combustion air is configured. The guide plate 8a is disposed at a portion of the wind box 6b which is widened over a width substantially equal to the width of the combustion zone B, and the shaft 8b is rotationally driven by a hydraulic mechanism (not shown). The flow from below to above in the wind box 6b is adjusted.

[0025] The combustion zone B, as the grate temperature detection mechanism 2a, a plurality of thermocouples, provided grate of the central portion in the width direction, and arranged in a direction along the transporting direction of the waste <br/> In addition, the incinerator has a computer-assisted air distribution control means 9 for controlling the air distribution adjustment mechanism 8 based on the temperature detected by the Rostor temperature detection mechanism 2a.
Is provided.

More specifically, the air distribution control means 9 comprises:
As shown in FIG.
The part where the temperature detected by a is the maximum value is determined to be the burn-out position of the dust in the incineration zone B, and as shown in FIG. 3, at least the downstream side from the determined burn-out position.
Distribution of combustion air supply (In the figure, the vertical axis represents air distribution
Display) to supply combustion air to the burn-off position.
The air distribution adjusting mechanism 8 is controlled to the first control state for increasing the supply distribution .

That is, in the combustion zone B, combustion is performed while shifting from gas combustion in which dust is gasified and burned by high temperature to solid combustion in which carbonized dust is burned. It becomes maximum near the transition point from the gas combustion region to the solid combustion region, that is, near the burn-out position . Therefore, when the temperature of the incineration zone is as high as about 400 ° C. at the burn-off position , the rostral constituting the combustion zone B is easily corroded by corrosive gas such as hydrogen chloride generated in the furnace. Furthermore, the combustion is almost finished
Downstream from the burn-off position , air is supplied wastefully even though less combustion air is required, which may cause a decrease in furnace temperature and prevent complete combustion in the secondary combustion region. . Therefore, the guide plate 8a
And its upper end is inclined to face in the upstream direction of the combustion zone B, the combustion air flowing upward from below the wind box 6, and attitude control to flow upstream from burnout position, burn While limiting the amount of supply to the downstream side from the cutting position ,
It is supplied to the upstream side for effective use, and the rostre at the burnout position is cooled down to about 300 ° C.

In this state, the air distribution control means 9 performs the first control when the detected temperature of the burn-out position detected by the rostral temperature detecting mechanism 2a becomes lower than the detected temperature on the upstream side. It said from the state-retardant
The air distribution adjusting mechanism 8 is controlled to a second control state in which the adjustment of the supply distribution of the burning air is released.

That is, the Rostor temperature at the burnout position is:
If the temperature is lower than the upstream Rostor temperature, the combustion state deteriorates conversely. Therefore, in order to suppress the cooling effect, the guide plate 8a is substantially separated from the combustion air flowing upward from below the wind box 6 by combustion. The posture is controlled so as to be in a parallel posture.

Another embodiment will be described below. In the previous embodiment, the guide plate 8a is described as being configured to be freely held at two positions of the first control state and the second control state. However, in the second control state, the guide plate 8a is The present invention is not limited to the configuration in which the posture of the combustion air flowing from the lower side to the upper side is substantially parallel to the posture of the combustion air. It is set at an intermediate position between the state where the flow becomes almost parallel to the flow, and while suppressing the excessive cooling of the Rostor temperature at the burnout position,
At the same time, a configuration may be adopted in which combustion air downstream from the burn-off position can be restricted to some extent.

In the above embodiment, the air distribution adjusting mechanism 8 is
Although a description has been given of the case in which the wind box 6 is constituted by a single guide plate 8a, as shown in FIG. 5, a plurality of guide plates such as two or three are arranged along the transport direction, and the angle of each guide plate is changed. May be independently adjustable so as to finely adjust the distribution of the supply amount of the combustion air .
Further, as shown in FIG. 6, a plurality of guide plates are independently provided in the width direction of the combustion zone B so as to be swingably adjustable, and a plurality of thermocouples are also provided along the width direction of the combustion zone B. Thus, the configuration may be such that variations in the burn-out position along the width direction are detected, and each can be appropriately adjusted.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an incinerator.

FIG. 2 is a sectional view of a main part of the incinerator.

FIG. 3 is a sectional view of a main part of the incinerator.

FIG. 4 is a characteristic diagram of the Rostor temperature.

FIG. 5 is a sectional view of a main part showing another embodiment.

FIG. 6 is a sectional view of a main part showing another embodiment.

FIG. 7 is a sectional view of a main part showing a conventional example.

[Explanation of symbols]

 2 Incineration zone 2a Rostor temperature detecting mechanism 6 Wind box 7 Blowing mechanism 8 Air distribution adjusting mechanism 8a Guide plate 9 Air distribution control means

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F23G 5/50 ZAB F23H 11/12 F23L 1/02

Claims (4)

(57) [Claims] 1. A wind box (6) for supplying combustion air to garbage on a stoker type incineration zone (2) is provided below the incineration zone (2). Blower mechanism (7) for supplying combustion air upward from below
A combustion air supply mechanism for refuse incinerator formed by providing a into the wind box (6), fuel supplied from the windbox (6)
An air distribution adjusting mechanism (8) for adjusting a supply amount distribution of the burning air in the wind box (6) in a direction along a conveying direction of the refuse to the incineration zone (2). A combustion air supply mechanism for the provided garbage incinerator. 2. A conveying direction of the refuse in the incineration zone (2).
Grate temperature detection mechanism that detects a temperature at a plurality of locations over (2a) and the grate temperature detecting mechanism (2a) the air distribution adjustment mechanism based on the temperature detected by the (8) air distribution control means for controlling (9) providing the door, the air distribution control means (9), wherein the grate temperature detection
From the temperature detected by the mechanism (2a), the incineration zone (2)
And determine at least
Supply of the combustion air downstream from the burn-off position
Reducing the volume distribution so that the combustion air
The air distribution to the first control state to increase the supply distribution of the air
2. The method according to claim 1, wherein the adjusting mechanism is configured to control the adjusting mechanism.
A combustion air supply mechanism for a refuse incinerator according to the description. 3. The air distribution control means (9), when the detected temperature of the burn-off position detected by the rostral temperature detecting mechanism (2a) becomes lower than the detected temperature on the upstream side thereof, The combustion air from one control state
The combustion air supply mechanism for a refuse incinerator according to claim 2 , wherein the air distribution adjustment mechanism (8) is controlled to a second control state in which the adjustment of the supply amount distribution is released. 4. An attitude adjusting mechanism for adjusting an air distribution adjusting mechanism (8) to adjust a distribution of a supply amount of combustion air supplied from a lower side to an upper side of the wind box (6) by the blowing mechanism (7). The combustion air supply mechanism for a refuse incinerator according to any one of claims 1 to 3, wherein the mechanism comprises a free guide plate (8a).