JPH10185157A - Method and device for judging refuse quality, and combustion control device of refuse incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for judging the refuse quality, and a combustion control device of a refuse incinerator capable of performing the continuous and stable refuse combustion control by detecting the quality of the refuse which is the one immediately after the combustion is started and on the upstream side of the center position of combustion to estimate the future condition of combustion. SOLUTION: An infrared ray detecting means 24a to detect the radiation temperature of the refuse in the ignition starting region in a stoker mechanism 6 is provided, and a lower calorific value presuming means 24 to presume the lower calorific value of the refuse based on the mean value per the prescribed time period of the detected temperature by the infrared ray detecting means 24a is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stoker mechanism for carrying out incineration while transporting refuse introduced into a furnace, and a wind box for supplying drying gas to refuse upstream from the stoker mechanism from below. The present invention relates to a garbage quality determination method and a garbage quality determination device for determining the properties of garbage input in a provided garbage incinerator, and a combustion control device for a garbage incinerator using the garbage quality determination method or the garbage quality determination device.

[0002]

2. Description of the Related Art As a conventional combustion control device for a refuse incinerator, a push-in mechanism is used to control the amount of refuse introduced into a furnace along a schedule line for achieving a target amount of garbage processed in a day. For those that adjust the garbage transport speed by the mechanism and the amount of combustion gas (usually air) from the wind box, and those that have a waste heat boiler, the amount of steam generated by the combustion heat generated in the furnace is the target steam. The amount of dust input by the pushing-in mechanism, the speed of transporting the dust by the stoker mechanism, and the combustion gas (usually air) from the wind box
There was something to adjust the amount. Then, an imaging means for detecting the end position of the combustion flame of the garbage from the downstream side of the stoker mechanism, that is, the burn-out position at which the gasification combustion ends, is provided, and the adjustment is performed so that the burn-out position falls within a predetermined range. By providing correction means for increasing or decreasing the amount of garbage charged, the conveying speed, and the amount of combustion gas, the target processing amount and the target steam amount are secured while achieving the target value of the cauterization loss. Was.

[0003]

However, according to the above-mentioned prior art, the correction means determines the correction amount based on the current burn-off position of the dust determined from the combustion image input by the imaging means. If the quality of the dust present upstream of the currently detected burn-off position is significantly different because the combustion state of the dust upstream of the detected burn-off position is not taken into account. In some cases, the combustion state may deteriorate over a long period of time. For example, if the current burn-off position is on the downstream side, the amount of dust input and the transport speed will be corrected to decrease, but if there is a large amount of high-quality dust on the upstream side at that time, The burn-out position suddenly shifts to the upstream side, resulting in a dust-out state in which the amount of residual dust in the furnace is reduced. If the current burn-out position is on the upstream side, the dust input amount and the transport speed are increased and corrected. However, if there is a large amount of poor quality garbage on the upstream side at that time, the burnout position shifts to the downstream side abruptly, and the garbage piles up in which the amount of garbage remaining in the furnace increases, In some cases, recovery is not easy. Therefore, a weight detection mechanism is installed in the crane mechanism that transports the dust to the dust hopper installed above the push-in mechanism, and the apparent specific gravity of the dust is calculated based on the dust weight detected by the weight detection mechanism and the crane volume. It is proposed to judge the garbage quality before combustion based on the value.However, not only is the garbage quality not fully determined due to the uneven gripping volume of the crane, Since the time until the introduction into the furnace is uncertain, this method cannot sufficiently control the change in waste quality. An object of the present invention is to solve the conventional drawbacks described above and detect the quality of dust immediately after the start of combustion and located upstream of the combustion center position, thereby predicting the future combustion state and continuing. It is an object of the present invention to provide a refuse quality determination method and apparatus, and a refuse incinerator combustion control apparatus capable of performing stable refuse combustion control.

[0004]

In order to achieve the above object, a first characteristic configuration of a waste quality determination method according to the present invention is a stoker mechanism for performing incineration while transporting dust loaded in a furnace; In a refuse incinerator provided with a wind box for supplying drying gas from below to refuse on the upstream side of the stalker mechanism, a refuse quality determination method for determining properties of refuse charged into the furnace, wherein the stoker The point is that the radiation temperature of the dust in the ignition start region in the mechanism is detected, and the lower heating value of the dust is estimated based on the detected radiation temperature. The second characteristic configuration of the dust quality determination method includes, in addition to the first characteristic configuration, an average value of the radiation temperature of the dust in the ignition start area per predetermined time is equal to or less than a first reference temperature set in advance. Low-quality refuse with a lower heating value lower than the assumed value.If the refuse is in the range from the first reference temperature to the second reference temperature, which is higher than the first reference temperature, the refuse is a low-value heating refuse satisfying the assumed value. If this is the case, the point is that it is determined to be high-quality dust having a lower heating value higher than the assumed value. The third characteristic configuration of the refuse quality determination method is such that, in addition to the second characteristic configuration, the first reference temperature and the second reference temperature each have a variable gas flow rate of the drying gas supplied from the wind box. The point is determined by a predetermined function.
The fourth characteristic configuration of the dust quality determination method, in addition to the first to third characteristic configurations, a change rate per second predetermined time shorter than the predetermined time of the radiation temperature of the dust in the ignition start area,
If the dust quality is more positive than the predetermined value, the dust quality suddenly changes to high-quality waste, and if the dust quality is more negative than the predetermined value, the dust quality suddenly changes to low-quality waste. is there.

A first characteristic configuration of the refuse quality determination apparatus according to the present invention includes a stoker mechanism for incineration while transporting refuse charged in a furnace, and a stoker mechanism for drying refuse on the upstream side of the stoker mechanism from below. In a refuse incinerator provided with a wind box for supplying gas, a refuse quality determination device that determines the properties of refuse charged into the furnace, wherein the radiant temperature of refuse in an ignition start area in the incineration processing unit is determined. An infrared detecting means for detecting is provided, and a low heat generation amount estimating means for estimating a low heat generation amount of dust based on a temperature detected by the infrared detecting means is provided. The second characteristic configuration of the garbage quality determination device is:
In addition to the first characteristic configuration, the lower heating value estimating means includes:
If the average value of the temperature detected by the infrared detecting means per predetermined time is equal to or lower than a preset first reference temperature, it is a low-quality refuse having a lower heating value lower than an assumed value, and is higher than the first reference temperature. If the temperature is within the range of the second reference temperature, it is determined that the dust is a low heat generation reference dust that satisfies the assumed value, and if the temperature is equal to or higher than the second reference temperature, the dust is high quality dust having a low heat generation that is higher than the assumed value. . The third characteristic configuration of the refuse quality determination device is such that, in addition to the second characteristic configuration, the first reference temperature and the second reference temperature each have a variable gas flow rate of the drying gas supplied from the wind box. The point is determined by a predetermined function. The fourth characteristic configuration of the dust quality determination device is the same as the first to third characteristic configurations, wherein the lower heating value estimating unit is configured to perform a second predetermined time shorter than the predetermined time of the temperature detected by the infrared detecting unit. If the rate of change per time is exactly greater than a predetermined value, the garbage quality suddenly changes to high-quality garbage,
If the value is more negative than a predetermined value, it is determined that the dust quality suddenly changes to low quality dust.

[0006] The characteristic configuration of the combustion control device for a refuse incinerator according to the present invention is that a stoker mechanism for incineration processing while transporting the refuse charged in the furnace, and a wind box disposed below the stoker mechanism. A garbage incinerator that is provided with a garbage incinerator that operates by determining the transfer speed of garbage by the stoker mechanism and the amount of combustion gas supplied to the garbage from the wind box based on a low heat generation amount of garbage assumed in advance. A combustion control device, comprising: the dust quality determination device according to any one of the first to fourth characteristic configurations described above, based on the dust quality determined by the dust quality determination device, the transfer speed or the combustion speed. The point is that the gas supply amount is determined to operate.

Hereinafter, the operation of the present invention will be described. There is no significant difference in the radiation temperature of the garbage immediately after being put into the furnace due to the quality of the garbage. The amount of heat cannot be determined. For example, even if the amount of water is large, such as crushed garbage with a large amount of heat generation, even if only the degree of water content is detected, the subsequent combustion state cannot be properly predicted,
According to the radiant temperature of the dust in the ignition start area detected by the infrared detecting means, as shown in the embodiment described later, the combustion temperature is relatively high for high-calorie garbage, and relatively low for low-calorie garbage. Is detected as a low combustion temperature, the subsequent combustion state can be estimated based on the detected value.

More specifically, an average value of the radiation temperature of dust in the ignition start area per predetermined time is obtained, and if the average value is equal to or lower than a preset first reference temperature, a low quality heat generation lower than the assumed value is obtained. It is garbage and is a reference garbage with a low calorific value that satisfies the assumed value if it is in the range from the first reference temperature to the second reference temperature higher than it. It can be determined that the amount is high-quality garbage. Here, from the viewpoint of the stability of the furnace operation, the predetermined time is equal to or lower than the first reference temperature indicating low-calorie garbage or equal to or higher than the second reference temperature indicating high-calorie garbage when judging the garbage quality. It is necessary to set the time shorter than the time that is expected to have a significant effect on the subsequent combustion state. Furthermore, as shown in the examples described later, it was confirmed that the first reference temperature and the second reference temperature had substantially a correlation with the gas flow rate of the drying gas supplied from the wind box. By determining the reference temperature by a predetermined function using the gas flow rate as a variable, the influence of disturbance can be avoided and the quality of dust can be accurately determined. Further, even if the dust quality is determined based on the average value of the temperature detected by the infrared detecting means per predetermined time, if there is an extreme change in the dust quality, the combustion state is greatly affected. If the rate of change per second predetermined time shorter than the predetermined value is more positive than the predetermined value, the dust quality suddenly changes to high-quality waste, and is negatively larger than the predetermined value. If there is, it is possible to more quickly and accurately determine the dust quality by preferentially determining that the dust quality suddenly changes to low-quality waste.

A stoker mechanism for incinerating the refuse charged in the furnace while transporting the refuse; and a wind box disposed below the stoker mechanism. In a combustion control device of a refuse incinerator which operates by determining a supply amount of combustion gas supplied to refuse from a box based on a low heat value of refuse assumed in advance, the above-described refuse quality determination method and device are used. By adopting, it is possible to determine and operate the transport speed or the supply amount of the combustion gas based on the determined refuse quality, that is, the lower heating value of the refuse. Control can be performed. here,
When determining the transport speed or the combustion gas supply amount based on the determined lower heat generation amount of dust, the transfer speed or the combustion gas supply amount determined based on the initially assumed lower heat generation amount of the dust is corrected. Alternatively, the lower heat generation amount of dust assumed at first may be replaced with the lower heat generation amount of the determined dust.

[0010]

Therefore, according to the present invention, the quality of the refuse immediately after the start of combustion and located in the ignition region on the upstream side of the combustion center position is detected, whereby the refuse is continuously and stably burned. It has become possible to provide a combustion control device for a refuse incinerator that can perform control.

[0011]

Embodiments of the present invention will be described below. As shown in FIG. 1, the refuse incinerator includes a refuse hopper 3 provided with a push-in mechanism 5 at the bottom thereof, and a stoker mechanism configured to incinerate while transporting the trash introduced by the push-in mechanism 5. Obi 6,7,8,
Ash pit 4 for collecting ash treated by the incineration zones 6, 7, 8; waste heat boiler 16 provided in a flue 2 formed above the incineration zones 6, 7, 8; It is constituted by the device 17 and the like.

The pushing-in mechanism 5 reciprocates a pushing action body (not shown) for pushing the dust put in the dust hopper 3 toward the dust inlet 1 by the hydraulic cylinder C1 to put dust into the furnace. It is configured to do so. The incineration zones 6, 7, and 8 include a drying zone 6 for drying while transporting the dust input from the input port 1 and a combustion zone 7 for transporting and burning the dust dried in the drying zone 6. A post-combustion zone 8 for incineration of the refuse burned in the combustion zone 7 is connected to the combustion zone 8 via steps d1 and d2. The stoker mechanism is configured to reciprocate G in a diagonal up and down direction by hydraulic cylinders C2, C3 and C4. Each of the incineration zones 6, 7, 8 is provided with a separate air box 12 at a lower portion thereof, and air for drying and combustion is supplied by a blower 13 through a supply path 14 provided with a heat exchanger T for temperature control. Each wind box 12 is provided with a damper D for adjusting the air supply amount. The residue incinerated in the post-combustion zone 8 falls on an ash chute 10 and is conveyed to the ash pit 4 by a conveyor mechanism.
Will be integrated. The waste heat boiler 16 generates steam by using thermal energy possessed by the flue gas that has been secondarily burned in the flue 2, and drives the steam turbine connected to the generator 18 to generate power by the generated steam. The waste heat boiler 16
The exhaust gas passing through the exhaust gas is exhausted from a chimney (not shown) through an exhaust gas treatment device 17 such as a bag filter or a smoke washing device.

The above-mentioned refuse incinerator uses an amount of steam detected by a steam amount detection sensor (not shown) provided in the waste heat boiler 16 as an index to incinerate a target amount of refuse. The amount of refuse introduced by the pushing-in mechanism, so that the amount of steam becomes a target amount of steam calculated and derived as the amount of steam to be generated in the waste heat boiler 16;
And a dust transport control means 22 for adjusting the transport speed of the dust by the incineration zones 6, 7, 8;
A combustion control device 20 including a supply air amount control means 23 for adjusting the amount of air blown from the air is provided. Here, the target steam amount is a low heat generation amount of waste assumed in advance, a total heat input amount such as a heat input amount by combustion air, and a heat output amount by an exhaust gas,
The value obtained by multiplying the difference in the total heat output such as the heat loss by the boiler efficiency is obtained as the heat amount used for steam generation, and the steam amount generated based on the heat amount is calculated and obtained.

On the ceiling wall of the drying zone 6, the drying zone 6
Camera 24a as infrared detecting means
And detects the radiation temperature of the dust surface in the ignition start area in the incineration zone. More specifically, the infrared detecting means 24a detects the radiant energy from the inside of the furnace corresponding to the blackbody radiant energy as shown in FIG. 2 and obtains the temperature. As shown in FIG. , C
In order to avoid an infrared energy absorption band due to O ₂ , NOx, SOx, and H ₂ O, a filter (not shown) having a transmission wavelength of about 3.9 (3.6 to 4) μm is provided in the infrared camera. It is configured so that the radiant energy can be measured by transmitting the combustion flame in the drying zone 6. The infrared camera 24a determines an area where the detected temperature is about 600 ° C. or higher as an ignition area, calculates an average value of the dust surface temperature in the area per predetermined time (30 minutes in the present embodiment), and based on that value. A low heat generation amount estimating means 24 for estimating the low heat generation amount of the dust is provided. More specifically, when the amount of air blown from the wind box of the drying zone 6 is a reference flow rate (a value specific to the furnace), FIG.
As shown in the figure, if the average value of the surface temperature of the dust per predetermined time is 900 ° C. or less, which is the first reference temperature, the dust is a low-quality waste having a small lower heating value and 1000 as the second reference temperature.
If the temperature is higher than ℃, the waste is high quality waste with a large lower heating value.
If the temperature is in the range of 00 ° C. to 1000 ° C., it is estimated that the dust is a reference dust having a low calorific value as expected, and furthermore, as shown in FIG. If the rate of change per second predetermined time (10 minutes in the present embodiment) shorter than the time (30 minutes in the present embodiment) is exactly 100 ° C. or more, it rapidly turns into high-quality dust having a large lower heating value, If the temperature is negatively 100 ° C. or higher, it is presumed that the dust rapidly turns into low-quality dust having a small lower heating value. Note that the detected temperature of the ignition region, the first and second reference temperatures, and the reference amounts of the rate of change are appropriately set in accordance with the furnace, and are not fixed to the above values. Further, the above-mentioned reference temperature is determined by a predetermined function shown in an embodiment described later using the amount of air (gas flow rate) from the wind box in the drying zone 6 as a variable, and is not a constant value.

The lower heating value estimating means 24 (24a, 2a)
4b), based on the lower heat generation amount of the dust estimated from the average temperature value per unit time, based on the lower heat generation amount of the dust, the amount of dust input by the push-in mechanism, The number of operations of the hydraulic cylinder C1 per unit time, and the transfer speed of dust by the stoker mechanism, that is, the hydraulic cylinders C2 and C
A first correcting means 22a for correcting the number of operations per unit time of the hydraulic cylinders C1, C2, and C3 when it is determined that the dust is low-quality dust. By gradually lowering the range, the amount of dust and the transport speed are reduced to avoid shifting to a poor combustion state. On the other hand, when it is determined that the dust is high quality, the hydraulic cylinders C1, The number of operations of C2 and C3 per unit time is corrected stepwise upward within a predetermined range, thereby increasing the amount of dust input and the transport speed to avoid shifting to a dust-out state, thereby reducing the amount of generated steam. Aim to stabilize Further, a second correction means 22b for further correcting the correction value by the first correction means 22a based on the lower heat generation amount of dust estimated from the rate of change per unit time is provided, so Suppress the fluctuation of the burn-off point. In other words, if the degree of change in the garbage quality (high quality, low quality) estimated from the average temperature value to the garbage quality (high quality, low quality) estimated from the change rate is large, it is suitable for each situation. Make corrections. For example, if the dust quality estimated from the average temperature value is high quality and the dust quality estimated from the change rate is high quality, it is determined that the generated steam amount further increases, and the second correction unit 22b determines If the correction value by the correction means 22a is corrected downward and the dust quality estimated from the average temperature value is high quality and the dust quality estimated from the change rate is low quality, the amount of generated steam will rapidly decrease in the future. It is determined that the second correction means 22b is
Is corrected upward. Conversely, if the waste quality estimated from the average temperature value is low quality and the waste quality estimated from the change rate is high quality, it is determined that there will be a sudden shortage of waste and a decrease in the amount of generated steam in the future. Correction means 22
b corrects the correction value by the first correction means 22a upward,
If the garbage quality estimated from the average temperature value is low quality and the garbage quality estimated from the change rate is low quality, it is determined that the amount of generated steam will further decrease in the future, and that there is a possibility that unburned fuel will be generated.
The second correction means 22b corrects the correction value of the first correction means 22a downward.

On the basis of the lower heat generation amount of the dust estimated from the average temperature value per unit time by the lower heat generation amount estimating means 24, the supply air amount control means 23 pre-sets drying for each wind box, A first correction unit 23a for increasing and decreasing the amount of air for combustion is provided, and when it is determined that the waste is low-quality dust, the opening degree of the damper mechanism D is increased to increase the supply amount, and drying, While promoting combustion and avoiding transition to a poor combustion state, if it is determined that the waste is high quality, reduce the amount of supply by reducing the opening of the damper mechanism D to suppress combustion. To avoid abnormal high-temperature combustion. Further, based on the lower heating value of the dust estimated from the rate of change per unit time, the first correction unit 23
The second correction means 23b for further correcting the correction value according to a is provided to suppress a sudden change in the generated steam amount and a change in the burn-off point. In other words, if the degree of change in the garbage quality (high quality, low quality) estimated from the average temperature value to the garbage quality (high quality, low quality) estimated from the change rate is large, it is suitable for each situation. Make corrections. For example, if the dust quality estimated from the average temperature value is high quality and the dust quality estimated from the change rate is high quality, it is determined that the generated steam amount is further increased, and the second correction unit 23b determines Correction means 23a
If the dust quality estimated from the average temperature value is high quality and the dust quality estimated from the change rate is low quality, it is determined that the amount of generated steam will rapidly decrease in the future. And the second correction means 23b
The correction value according to 3a is corrected in the increasing direction. Conversely, if the dust quality estimated from the average temperature value is low quality and the dust quality estimated from the change rate is high quality, it is determined that the amount of generated steam will rapidly increase in the future, and the second correction unit 23b determines The correction value by the first correction unit 23a is corrected in a decreasing direction,
If the dust quality estimated from the average temperature value is low quality and the dust quality estimated from the change rate is low quality, it is determined that the generated steam amount will be further reduced in the future, and the second correction unit 23b will determine the first correction unit 23a. Is corrected in the increasing direction. In other words, both of the above-described first correction means 22a and 23a ensure the stability of the steam generation amount in the steady state where the fluctuation of the lower heating value is small, and
Both b and 23b ensure the stability of the steam generation amount in the transient state where the fluctuation of the lower heating value is large, and the correction amount is determined according to the characteristics of each furnace.

A part or all of the function realizing means constituting the above-described combustion control device 20 is configured using various computers such as microcomputers, memory circuits, and other known peripheral circuit technologies.

Hereinafter, another embodiment will be described. In the above-described embodiment, the infrared detecting means is provided with the filter having the wavelength of 3.9 μm. However, the filter may be provided between the object to be measured and the radiation temperature measuring instrument 1 even if it is not a filter having the wavelength of 3.9 μm. Any wavelength can be used as long as it can avoid the infrared energy absorption band by the gas interposed in the gas. Furthermore, the infrared detecting means is not limited to an infrared camera, and can be configured using a known infrared detecting element as appropriate.
For example, a spot-type infrared sensor is provided so as to face the inside of the furnace from a measurement hole formed in the ceiling wall of the drying zone 6, and the surface temperature of the dust on the drying zone 6 is set to a spot diameter of several tens mm to several hundred mm. May be configured to measure at a plurality of locations.

[0019]

Embodiments will be described below. 120t / day
In a continuous operation type real furnace having a processing capacity of 1, the dust immediately before being put into the dust hopper was sampled, the lower heating value was analyzed, and the emission temperature of the dust in the ignition start region in the furnace for the dust was measured. The dry air supply is about 2
50 ((Nm ³ ) / m ² ) constant, and the transport time delay from the dust hopper input to the measurement point was obtained by an estimation calculation from the crane grip weight, the hopper volume, and the dust transport speed (constant). As a result, as shown in FIG. 5, it was found that there was a certain correlation between the dust surface temperature and the lower heating value. From this, it is possible to make a sufficient estimation for discriminating low-quality waste having a calorific value of about 1500 Kcal / kg and high-quality waste with a calorific value of about 2000 Kcal / kg, which were difficult to cope with with the conventional automatic garbage combustion control. It became clear that it was. Next, during the actual operation, since the dust transport speed and the dry zone air flow rate fluctuated, how the measured values fluctuated due to these factors was evaluated. As a result, as shown in FIG. 6, even if the transport speed of the drying zone stoker mechanism is changed, almost no effect is observed, and as shown in FIG. 7, the measured value tends to decrease with an increase in the drying zone air flow rate. It was observed. That is, it has been found that the measured value decreases while maintaining the amplitude of about 200 ° C. to 300 ° C., regardless of whether the air flow rate in the drying zone is gradually increased or decreased in a normal furnace operation state. Therefore, it is considered that the effect of the increase in the flow rate only causes a substantially constant temperature decrease as a whole, and has little effect on the amplitude of the surface temperature due to the dust quality, and is shown in FIG. The correction can be easily performed by changing the first and second reference temperatures. Specifically, as shown in FIG. 8, the tangents (Equations 1 and 2) drawn to the lower and upper limits in FIG. By calculating and changing the surface temperature evaluation reference value, that is, the first and second reference temperatures, from the evaluation reference lines (Equations 3 and 4) shifted upward and the dry zone air flow rate, the influence of the dry zone air flow rate can be corrected.

[0020]

## EQU1 ## Lower limit tangent; (surface temperature) =-0.6 (dry zone air flow rate) +930

[0021]

## EQU2 ## Upper limit tangent; (surface temperature) =-0.6 (dry zone air flow rate) +1200

[0022]

## EQU3 ## First reference temperature (low-quality side reference temperature) =-0.6 (dry zone air flow rate) +9
30 + ΔTbtm

[0023]

## EQU4 ## Second reference temperature (high-quality side reference temperature) =-0.6 (dry zone air flow rate) +1
200 + ΔTtop

Here, the constants represented by the above equations are based on experiments, and are values that are appropriately determined according to each furnace.

[Brief description of the drawings]

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

FIG. 2 is a graph showing wavelength characteristics of black body radiation energy.

FIG. 3 is a characteristic diagram of the transmittance of the atmosphere.

FIG. 4 is an explanatory diagram showing a lower heating value estimation table.

FIG. 5 is an explanatory diagram showing a correlation between a dust surface temperature and a lower heating value.

FIG. 6 is an explanatory diagram showing characteristics of dust surface temperature due to a change in dust transport speed.

FIG. 7 is an explanatory diagram showing a characteristic of dust surface temperature due to fluctuation of dry zone air.

FIG. 8 is an explanatory diagram of setting a reference temperature for evaluating waste quality.

[Explanation of symbols]

 6, 7, 8 Stalker mechanism 12 Wind box 24a Infrared ray detecting means 24 Low heat generation amount estimating means

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Masataka Shichiri 1-1-1 Hama, Amagasaki City, Hyogo Prefecture Inside Kubota Technology Development Laboratory Co., Ltd.

Claims (9)

[Claims] 1. A refuse incinerator provided with a stoker mechanism for incineration processing while transporting refuse introduced into the furnace, and a wind box for supplying drying gas to refuse upstream from the stoker mechanism from below. A trash quality determination method for determining the properties of trash introduced into the furnace, wherein the stoker mechanism detects the radiant temperature of the refuse in the ignition start area, and converts the detected radiant temperature to an average value per a predetermined time. A garbage quality determination method for estimating the lower heating value of garbage based on the garbage. 2. If the average value of the radiation temperature of the dust in the ignition start area per predetermined time is equal to or lower than a first reference temperature set in advance, it is low-quality dust having a lower heating value lower than an assumed value,
If it is in the range from the first reference temperature to the second reference temperature higher than that, it is a reference waste with a lower heating value that satisfies the assumed value,
2. The dust quality determination method according to claim 1, wherein if the temperature is equal to or higher than the second reference temperature, the dust is determined to be high quality dust having a lower heating value higher than an assumed value. 3. The first reference temperature and the second reference temperature,
3. The dust quality determination method according to claim 2, wherein the dust quality is determined by a predetermined function using a gas flow rate of the drying gas supplied from the wind box as a variable. 4. A change rate of the radiation temperature of dust in the ignition start area per second predetermined time shorter than the predetermined time regardless of the average value of the radiation temperature of dust in the ignition start area per predetermined time. It is determined that the trash quality is suddenly changed to high-quality garbage if the garbage quality is larger than a predetermined value, and that the garbage quality is suddenly changed to a low-quality garbage if the garbage quality is more negative than a predetermined value. A trash quality determination method according to any one of 1 to 3. 5. A refuse incinerator provided with a stoker mechanism for incineration processing while transporting refuse introduced into the furnace, and a wind box for supplying a drying gas to refuse on the upstream side of the stoker mechanism from below. A dust quality determination device that determines the properties of dust put into the furnace, provided with infrared detection means for detecting the radiation temperature of the dust in the ignition start area in the stoker mechanism, the detection temperature of the infrared detection means A dust quality determination device provided with low heat generation amount estimating means for estimating a low heat generation amount of dust based on an average value per predetermined time. 6. The low heat generation amount estimating means, wherein an average value of a temperature detected by the infrared detecting means per predetermined time is:
If the temperature is equal to or lower than the preset first reference temperature, it is low-quality waste having a lower heating value lower than the expected value, and if the temperature is in the range of the second reference temperature higher than the first reference temperature, the lower heating value satisfying the expected value. 6. The dust quality determination device according to claim 5, wherein the amount of the reference dust is equal to or higher than the second reference temperature, and is determined to be a high-quality dust having a lower heating value higher than an assumed value. 7. The first reference temperature and the second reference temperature,
7. The dust quality determination device according to claim 6, wherein the dust quality determination device is determined by a predetermined function using a gas flow rate of the drying gas supplied from the wind box as a variable. 8. The second predetermined time shorter than the predetermined time of the temperature detected by the infrared detecting means, regardless of an average value of the temperature detected by the infrared detecting means per predetermined time, If the change rate per hit is positively larger than a predetermined value, the trash quality is suddenly changed to high-quality garbage, and if the change rate is larger than negative than a predetermined value, the trash quality is changed to low-quality garbage. The trash quality determination apparatus according to claim 5, wherein the trash quality determination apparatus determines that a sudden change occurs. 9. A stoker mechanism for performing incineration processing while transporting refuse introduced into a furnace, and a wind box disposed below the stoker mechanism, wherein a trash transport speed of the stoker mechanism, and It is a combustion control device of a refuse incinerator that operates by determining a supply amount of combustion gas supplied from a wind box to refuse based on a low heat value of refuse assumed in advance. And a refuse configured to operate by determining the transport speed or the supply amount of the combustion gas based on the refuse quality determined by the refuse quality determination apparatus. Combustion control device for incinerator.