JP2000274638A - Burning method and apparatus for combustion furnace waste incinerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and an apparatus for burning capable of stabilizing a steam flow rate of a boiler and stabilizing combustion of a fuel by controlling a fuel supply amount of a combustion furnace waste incinerating furnace. SOLUTION: In the combustion furnace having a heat recovering unit for thermally recovering from an exhaust gas obtained by burning a fuel to generate steam, a reference value of an exhaust gas temperature obtained by considering a delay of a time change of a stream flow side of the unit to a time change of the exhaust gas temperature from a measured value of a steam flow rate generated from the unit is obtained, and the fuel is controlled by a comparison of the measured value of the exhaust gas temperature with the reference value.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion furnace for burning solid fuel such as waste, coal or the like, liquid fuel such as petroleum, or gaseous fuel such as a combustible gas, and more particularly to a combustion furnace produced by burning the fuel. The present invention relates to a combustion method and a combustion apparatus for a combustion furnace for stabilizing a steam flow rate of a heat recovery unit that generates heat by recovering heat from exhaust gas and stabilizing combustion of the fuel.

[0002]

2. Description of the Related Art In a combustion furnace for burning solid fuel such as waste, coal or the like, liquid fuel such as petroleum, or gaseous fuel such as a flammable gas, a boiler is used to recover thermal energy of exhaust gas generated by combustion of the fuel. In many cases, a steam is generated by the turbine using the heat recovery device, and it is desired to obtain a stable steam flow rate in the heat recovery device.

[0003] As a prior art, a combustion furnace using municipal waste or industrial waste as a fuel is a typical example, and a schematic configuration of the waste combustion furnace is shown in FIG. Combustion furnace waste incinerator 1
In the above, the fuel is pushed into the combustion chamber 15 from the fuel supply port 2 by the fuel pushing device 3, and is dried, burned, and ignited on the grate 4 provided inside the combustion chamber 15 to become ash, and the ash becomes ash. It is discharged out of the furnace from the discharge port 5. The supply amount of the fuel is determined by the pushing movement of the fuel pushing device 3 and the grate sliding device 1 for reciprocating the movable stage constituting the grate 4.
4 reciprocating movement. A boiler 7 for recovering thermal energy of exhaust gas generated by burning fuel on the grate 4 is provided in an exhaust gas passage 12 located downstream of a combustion chamber 15. The boiler 7 has a heat exchanger 7b for exchanging heat of the exhaust gas with boiler water and a steam generator 7a for generating steam from the boiler water. Steam generator 7a
The steam generated in is used for, for example, generating power using a turbine (not shown). The exhaust gas is an exhaust gas treatment device 13
After the harmful substances are removed by the exhaust gas, the exhaust gas is exhausted from the chimney 16.

In the boiler 7, in order to obtain a stable steam flow rate, the fuel supply amount is controlled based on a deviation between a measured value of a steam flow meter 11 installed at a steam outlet of the boiler 7 and a target value. Have been done. That is, when the steam flow rate of the boiler 7 exceeds the predetermined target value, the fuel supply is stopped, and when the steam flow rate falls below the predetermined target value, the fuel supply is started. In this case, the heat exchanger 7 provided in the exhaust gas passage 12
In (b), there is a time delay before the heat of the exhaust gas is transmitted to the boiler water and appears in a change in the steam flow rate, and the time delay causes a change in the steam flow rate, which makes it difficult to obtain a stable steam flow rate. Therefore, according to the knowledge of the inventor, using the exhaust gas temperature measured in real time by the non-contact type temperature sensor 6 and the steam flow rate measured by the steam flow meter 11 of the boiler 7, the fuel of the combustion furnace 1 waste combustion furnace is used. There is an idea to control the supply.

[0005]

Using the exhaust gas temperature measured in real time by the non-contact type temperature sensor and the steam flow rate measured by the steam flow meter of the boiler, the fuel supply amount of the combustion furnace waste combustion furnace is determined. Although there was an idea to obtain a stable steam flow rate by controlling, there was a problem that the concrete means was not completed. Further, in recent years, there has been an increasing need to stabilize fuel combustion for reducing the generation of dioxins and NOx as an environmental measure.

SUMMARY OF THE INVENTION The present invention has been made to solve at least one of the above-mentioned problems, and it is an object of the present invention to measure a measured value of a steam flow rate generated by a heat recovery unit such as a boiler for recovering heat from exhaust gas generated by fuel combustion. A combustion method for obtaining a reference value of the exhaust gas temperature in consideration of the time change of the steam flow rate of the heat recovery unit with respect to the time change of the exhaust gas temperature, and controlling the fuel by comparing the reference value and the measured value of the exhaust gas temperature. And a combustion device.

[0007]

According to one aspect of the present invention, there is provided a combustion furnace having a heat recovery unit that recovers heat from exhaust gas generated by fuel combustion to generate steam. From the measured value of the steam flow rate generated in the heat recovery unit, a reference value of the exhaust gas temperature taking into account the time change of the steam flow rate of the heat recovery unit with respect to the time change of the exhaust gas temperature is determined, and the reference value and the exhaust gas temperature are calculated. The feature is to control the fuel by comparing with the measured value.

According to a second aspect of the present invention, the reference value of the first aspect is multiplied by a gain obtained by multiplying a gain obtained by multiplying a deviation between a measured value of the steam flow generated by the heat recovery unit and a predetermined set value by a gain. It is characterized in that it is obtained by adding a time average value of the measured values, and the supply amount of the fuel is controlled using a deviation between the measured value of the exhaust gas temperature and the reference value.

According to a third aspect of the present invention, in the control of the fuel supply amount according to the first or second aspect, a time average value of a deviation between the measured value of the exhaust gas temperature and the reference value is larger than a predetermined judgment value. The fuel supply amount is increased when the value changes from a small value to a small value, and the fuel supply amount is reduced when the time average of the deviation changes from a small value to a large value as compared with a predetermined judgment value. .

According to a fourth aspect of the present invention, in order to more effectively implement the first to third aspects of the present invention, in the control of the fuel supply amount, the deviation between the measured value of the exhaust gas temperature and the reference value is When the difference is equal to or more than the predetermined first upper limit value and equal to or more than the second upper limit value, the upper limit judgment value to be compared with the deviation is set to the second upper limit value, and after a predetermined time elapses, the upper limit judgment value is set to the second upper limit value. It is characterized by gradually returning from the value to the first upper limit.

According to a fifth aspect of the present invention, in order to more effectively implement the first to fourth aspects of the present invention, in the control of the fuel supply amount, the deviation between the measured value of the exhaust gas temperature and the reference value is a predetermined value. The fuel supply amount is reduced when the value becomes equal to or less than the first lower limit and becomes equal to or less than the second lower limit.

According to a sixth aspect of the present invention, in the first to fifth aspects of the present invention, there is provided a fuel pushing device for pushing a fuel into a furnace from a fuel supply port, a grate for burning the pushed fuel, and the grate. In a combustion furnace waste incinerator provided with a grate sliding device that reciprocates a movable stage that constitutes, when the fuel supply amount is increased, the pushing motion of the fuel pushing device or the grate sliding device When increasing at least one speed of the reciprocating motion and decreasing the fuel supply amount, the fuel is reduced by reducing at least one speed of the pushing motion of the fuel pushing device or the reciprocating mobility of the grate sliding device. It is characterized by controlling the increase and decrease of the supply amount.

According to a seventh aspect of the present invention, there is provided a combustion furnace having a heat recovery unit for recovering heat from exhaust gas generated by fuel combustion and generating steam, wherein a steam flow meter for measuring a steam flow rate of the heat recovery unit is provided. A temperature sensor for measuring the exhaust gas temperature, from the measured value of the steam flow meter, to obtain a reference value of the exhaust gas temperature taking into account the time change of the steam flow with respect to the time change of the exhaust gas temperature, the reference value and the exhaust gas temperature And a control device for controlling the fuel by comparing the measured value with the measured value.

According to an eighth aspect of the present invention, in the invention of the seventh aspect, the fuel supply control device averages the temperature of the temperature sensor over time, And a value obtained by multiplying a deviation of a predetermined set value by a gain to an output value of the temperature-time averaging processor is set as a reference value, and a deviation between the measured value of the temperature sensor and the reference value is obtained. An upper and lower limit comparator for comparing the magnitude of a predetermined judgment value, and a control device for controlling the fuel supply amount using an output value of the upper and lower limit comparator are provided.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the embodiments shown in FIGS. However, the dimensions, shapes, relative positions, and the like of the components described in this embodiment are not intended to limit the scope of the present invention, but are merely illustrative, unless otherwise specified. . The same members as those in the conventional example shown in FIG.

FIG. 1 shows a schematic configuration of a control circuit in a combustion supply control device 10 according to one embodiment of the present invention.
The temperature sensor is provided in the exhaust gas passage 12 located downstream of the combustion chamber 15 in order to measure the temperature of the exhaust gas generated by the combustion of the fuel. In order to control the steam flow rate of the heat recovery unit such as the boiler 7 using the exhaust gas temperature measured in real time, the temperature sensor is preferably provided near the heat recovery unit such as the boiler 7. In order to measure the exhaust gas temperature in real time, the temperature sensor is preferably a non-contact temperature sensor 6 typified by an infrared radiation thermometer. When the measurement window is easily contaminated with soot and dust in the exhaust gas, an acoustic gas thermometer is used as the non-contact temperature sensor 6. In order to stabilize the steam used in the turbine, etc., the steam flow meter 11 is installed at a steam outlet of a heat recovery unit such as the boiler 7, and measures the steam flow rate under almost the same conditions as the steam used in the turbine. I do. The non-contact type temperature sensor 6 and the steam flow meter 11 are electrically connected to the combustion supply control device 10. The combustion supply control device 10 includes a fuel pushing device driving unit 8 such as a hydraulic cylinder that drives the fuel pushing device 3;
The grate sliding device 14 is electrically connected to a grate sliding device driving unit 9 such as a hydraulic cylinder that drives the grate sliding device 14.

A control method in the combustion supply control device 10 will be specifically described. The exhaust gas temperature measured by the non-contact type temperature sensor 6 is multiplied by a value obtained by multiplying the difference between the steam flow rate measured by the steam flow meter 11 and the preset steam flow rate set value by a gain. The reference value of the exhaust gas temperature is calculated by adding the time averaged value according to 21. Here, the value of the gain is determined in consideration of the unit conversion of the exhaust gas temperature and the steam flow rate and the delay of the time change of the steam flow rate in the boiler 7 with respect to the time change of the exhaust gas temperature. Also,
The time in which the temperature of the exhaust gas measured in real time by the non-contact type temperature sensor 6 is averaged by the temperature-time averaging processor 21 is determined in consideration of the delay of the time change of the steam flow rate in the boiler 7 with respect to the time change of the exhaust gas temperature. Typically, it is about 10 minutes immediately before the measurement by the non-contact type temperature sensor 6. The deviation between the exhaust gas temperature measured in real time by the non-contact type temperature sensor 6 and the reference value calculated at the measurement time of the exhaust gas temperature is time-averaged by the deviation time averaging processor 22 and input to the upper and lower limit comparator 23. . The deviation between the exhaust gas temperature and the reference value may be directly input to the upper and lower limit comparator 23 without time averaging. In the upper and lower limit comparator 23,
The output value of the deviation time averaging processor 22 is compared with a predetermined judgment value input in advance, and the result is used to control the fuel supply amount. Since the exhaust gas temperature can be measured in real time by the non-contact temperature sensor 6, the fuel supply amount is controlled using both the exhaust gas temperature measured by the non-contact temperature sensor 6 and the steam flow rate of the boiler measured by the steam flow meter 11. As compared with the case where the fuel supply amount is controlled using only the steam flow rate, the fuel supply amount can be controlled without time delay, and as a result, the exhaust gas temperature and the steam flow rate can be stabilized.

FIGS. 2 to 5 show more specific control methods. As shown in FIG. 2, when the output value of the deviation time averaging processor 22 changes from a large value to a small value as compared with a predetermined judgment value, the fuel supply amount is increased (control signal ON),
When the output value of the deviation time averaging processor 22 changes from a small value to a large value as compared with a predetermined judgment value, a control signal for reducing the fuel supply amount (control signal OFF) is sent to the fuel pushing device driving unit 8. To the drive unit 9 for the grate sliding device. The output value of the deviation time averaging processor 22 is a deviation of the exhaust gas temperature measured in real time from the reference value of the exhaust gas temperature in consideration of the time change of the steam flow rate of the heat recovery unit such as the boiler 7 with respect to the time change of the exhaust gas temperature. It is. Therefore, when the output of the deviation time averaging processor 22 starts to decrease and becomes equal to or less than a predetermined judgment value, the fuel supply amount is increased, so that a decrease in the exhaust gas temperature can be substantially suppressed. Conversely, if the output of the deviation time averaging processor 22 starts to rise and becomes equal to or higher than a predetermined judgment value, the fuel supply amount is reduced, so that the rise in exhaust gas temperature can be substantially suppressed.
That is, the exhaust gas temperature can be stabilized. Further, the exhaust gas temperature is closely related to the steam flow rate, and the output of the deviation time averaging processor 22 is a function of the boiler 7 with respect to the time change of the exhaust gas temperature.
The output value of the deviation time averaging processor 22 is used because the deviation between the reference value of the exhaust gas temperature and the real-time exhaust gas temperature taking into account the delay of the time change of the steam flow rate is not the value of the exhaust gas temperature itself. By controlling the fuel supply amount in this way, the steam flow rate of the boiler 7 can also be stabilized.

On the other hand, as described above, the deviation time averaging processor 22
If the output value is increasing, the fuel supply amount is reduced so as to decrease the output value.However, if the fuel supply amount is reduced too much, there is sufficient fuel to be burned when the output value starts to decrease. Is in shortage. Therefore, when the output value of the deviation time averaging processor 22 becomes equal to or more than a second upper limit that is larger than the predetermined first upper limit, the output value of the deviation time averaging processor 22 is compared with the output value of the deviation time averaging processor 22 as shown in FIG. The upper limit judgment value to be replaced is replaced with a second upper limit value, and after a lapse of a predetermined time, the upper limit judgment value to be compared is gradually returned from the second upper limit value to the first upper limit value. Thereby, when the output value of the deviation time averaging processor 22 starts to decrease, the upper limit judgment value to be compared is set to the first upper limit judgment value.
Since the second upper limit is larger than the upper limit, the control signal (control signal ON) for increasing the fuel supply amount at a time earlier than the case where the upper limit judgment value to be compared is the first upper limit.
It is possible to operate the drive unit 8 for the fuel pushing device and the drive unit 9 for the grate sliding device in advance.
A decrease in the output value of the deviation time averaging processor 22 can be suppressed at an earlier point in time. As a result, the fuel supply amount can be controlled to be increased in advance, so that a shortage of the fuel supply amount can be avoided.

Further, when the output value of the deviation time averaging processor 22 is falling, the fuel supply amount is increased so as to increase the output value. A phenomenon occurs in which the refuse combustion area on the grid 4 is buried with fuel and, on the contrary, hinders combustion. Therefore, as shown in FIG. 4, the output value of the deviation time processor 22 is
When the value becomes equal to or less than a second lower limit smaller than the first lower limit, the lower limit judgment value to be compared with the output value of the deviation time averaging processor 22 is replaced with a third lower limit smaller than the second lower limit. After a lapse of a predetermined time, the lower limit judgment value is gradually returned from the third lower limit to the first lower limit. Thus, when the lower limit judgment value to be compared is replaced with the third lower limit value smaller than the second lower limit value, the output value of the deviation time averaging processor 22 becomes a value larger than the lower limit judgment value to be compared, and This is a control signal (control signal OFF) for reducing the supply amount.
That is, when the output value of the deviation time averaging processor 22 becomes equal to or less than the second lower limit before the output value becomes the third lower limit, the fuel supply amount can be reduced in advance, and the control for excessively increasing the fuel is performed. Can be avoided, and the situation where the combustion area on the grate 4 in the combustion chamber 15 is filled with fuel can be avoided. FIG. 5 shows a control flow diagram summarizing the above.

The control of the increase or decrease of the fuel supply amount is such that when increasing the fuel supply amount, at least one of the pushing movement of the fuel pushing device 3 and the reciprocating movement of the grate sliding device 14 is increased. The driving unit 8 for the fuel pushing device or the driving unit 9 for the grate sliding device corresponding to the movement of the grate is driven. Conversely, when the fuel supply amount is reduced, the driving of the fuel pushing device corresponding to each movement is performed so as to decrease the speed of at least one of the pushing motion of the fuel pushing device 3 or the reciprocating motion of the grate sliding device 14. The driving unit 9 or the driving unit 9 for the grate sliding device is driven. Since the speed of the pushing motion of the fuel pushing device 3 and the reciprocating motion of the grate sliding device 14 is controlled to control the increase and decrease of the fuel supply amount, the combustion furnace 1
The amount of waste in the waste combustion region can be evenly distributed, and the combustion can be stabilized.

The exhaust gas temperature measured by the non-contact type temperature sensor 6 (here, an infrared radiation thermometer is used) and the steam flow rate measured by the steam flow meter 11 of the boiler 7 are compared with the combustion method and combustion method of the prior art and the present invention. FIGS. 6 and 7 show the case where the fuel supply amount is controlled using the apparatus. Employing the combustion method and the combustion apparatus according to the present invention can stabilize both the exhaust gas temperature and the steam flow rate of the boiler 7 as compared with the conventional combustion method and the combustion apparatus.

Further, the concentration of oxygen (O ₂ ), the concentration of carbon monoxide (CO), and the concentration of nitrogen oxide (NOx) at the entrance of the chimney 16 for exhaust gas were measured using the combustion method and the combustion apparatus according to the prior art and the present invention. FIGS. 8 and 9 show the respective wastes when the fuel supply amount is controlled. The combustion method and the combustion apparatus according to the present invention are more stable than the prior art combustion method and the combustion apparatus, and the combustion is stable, and the absolute value of the CO concentration at the entrance of the chimney 16 of the exhaust gas serving as a substitute index of dioxin and The fluctuation range is small. Further, the absolute value and the variation ranges of well NOx concentration of O ₂ concentration in the 16 inlet portion chimney exhaust gas also is small.

[0024]

As described in detail above, claims 1 and 2,
According to the inventions described in 3, 7, and 8, since the fuel supply amount is controlled using the exhaust gas temperature measured in real time by the non-contact thermometer and the steam flow rate of the boiler measured by the steam flow meter, there is no time delay. The fuel supply amount can be controlled, and as a result, the exhaust gas temperature and the steam flow rate can be stabilized. That is, the combustion can be stabilized, and the absolute value and the fluctuation range of the CO concentration at the chimney entrance of the exhaust gas, which is a substitute index for dioxin, can be reduced. Further, the fluctuation range of the O ₂ concentration and the absolute value and the fluctuation range of the NOx concentration at the chimney entrance of the exhaust gas can be reduced.

According to the fourth aspect of the invention, in addition to the effects of the first to third aspects of the invention, the fuel supply amount can be controlled to be increased in advance, so that the fuel supply amount becomes insufficient. can avoid.

According to the fifth aspect of the present invention, in addition to the effect of any one of the first to fourth aspects of the present invention, the control of increasing the fuel excessively by reducing the fuel supply amount in advance. By avoiding this, it is possible to avoid a situation where the combustion area of the combustion furnace is filled with fuel.

According to the invention described in any one of claims 6 to 8, in addition to the effect of any one of the inventions described in claims 1 to 5, the pushing motion of the fuel pushing device and the grate sliding device are performed. By controlling the speed of the reciprocating motion of the refuse, the increase and decrease of the fuel supply amount are controlled, so that the amount of waste in the refuse combustion region of the combustion furnace can be uniformly distributed, and the combustion can be stabilized.

Further, according to the present invention, the temperature of the exhaust gas is detected by the non-contact type temperature sensor without time delay, and the pushing motion of the fuel pushing device and the reciprocating motion of the grate sliding device are appropriately performed. , And the amount of waste is too small and too large, so that combustion can be stabilized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a control circuit in a combustion device showing an example of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of a specific control method showing an example of an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a specific control method (upper limit judgment value) showing an example of an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a specific control method (lower limit judgment value) showing an example of an embodiment of the present invention.

FIG. 5 is a specific control flowchart showing an example of an embodiment of the present invention.

FIG. 6 is a diagram showing a time change of an exhaust gas temperature and a steam flow rate of a boiler in a combustion furnace waste incinerator employing a combustion method and a combustion apparatus according to a conventional technique.

FIG. 7 is a diagram showing changes over time of the exhaust gas temperature and the steam flow rate of a boiler in a combustion furnace waste incinerator employing the combustion method and the combustion apparatus of the present invention.

FIG. 8 shows an oxygen (O ₂ ) concentration, a carbon monoxide (CO) concentration, and a nitrogen oxide (NOx) concentration at an inlet of an exhaust gas stack of a combustion furnace waste incinerator employing a combustion method and a combustion apparatus according to a conventional technique. FIG. 6 is a diagram showing a time change of the data.

FIG. 9 shows an oxygen (O ₂ ) concentration, a carbon monoxide (CO) concentration, and a nitrogen oxide (NOx) concentration at an inlet of an exhaust gas stack of a combustion furnace waste incinerator employing the combustion method and the combustion apparatus according to the present invention. FIG. 6 is a diagram showing a time change of the data.

FIG. 10 is an explanatory view of a conventional combustion furnace.

[Explanation of symbols]

 DESCRIPTION OF REFERENCE NUMERALS 1 combustion furnace waste incinerator 3 fuel pushing device 4 grate 7 boiler 8 drive unit for fuel pushing device 9 drive unit for grate sliding device 10 fuel supply control device 11 steam flow meter 12 exhaust gas passage 14 grate sliding device 21 Temperature time average processor 22 Deviation time average processor 23 Upper / lower limit comparator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hirohiko Orita 1-8-1 Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory (72) Inventor Yasuhiro Takatsudo 1-8-8 Koura, Kanazawa-ku, Yokohama-shi, Kanagawa Address 1 Mitsubishi Heavy Industries, Ltd. Yokohama Research Laboratory F-term (reference) 3K065 AA01 AB01 AC01 AC20 BA03 JA05 JA18

Claims (8)

[Claims] 1. A combustion furnace having a heat recovery unit for recovering heat from exhaust gas generated by combustion of a fuel to generate steam, wherein a time change of exhaust gas temperature is measured from a measured value of a steam flow rate generated by the heat recovery unit. A reference value of the exhaust gas temperature taking into account the delay of the time change of the steam flow rate of the heat recovery unit with respect to the temperature, and controlling the fuel by comparing the reference value with the measured value of the exhaust gas temperature. . 2. The method according to claim 1, wherein the reference value is obtained by adding a time average value of the measured value of the exhaust gas temperature to a value obtained by multiplying a gain by a deviation between a measured value of a steam flow generated by the heat recovery unit and a predetermined set value. The method according to claim 1, wherein the amount of the supplied fuel is controlled using a deviation between the measured value of the exhaust gas temperature and the reference value. 3. The fuel supply amount control method according to claim 1, wherein the time average value of the deviation between the measured value of the exhaust gas temperature and the reference value changes from a large value to a small value as compared with a predetermined judgment value. 3. The combustion furnace waste incineration according to claim 1, wherein the fuel supply amount is reduced when the time average value of the deviation changes from a small value to a large value as compared with a predetermined judgment value. Furnace combustion method. 4. In the control of the fuel supply amount, when a deviation between the measured value of the exhaust gas temperature and the reference value is equal to or more than a predetermined first upper limit and is equal to or more than a second upper limit, the deviation is determined. The upper limit judgment value to be compared is set to a second upper limit value, and after a predetermined time has elapsed, the upper limit judgment value is gradually returned from the second upper limit value to the first upper limit value. The combustion method of the combustion furnace waste incinerator according to the above. 5. The fuel supply amount control method according to claim 1, wherein when the deviation between the measured value of the exhaust gas temperature and the reference value becomes equal to or less than a predetermined first lower limit and equal to or smaller than a second lower limit, the fuel supply amount is reduced. The method for burning a waste incinerator of a combustion furnace waste according to any one of claims 1 to 4, wherein: 6. A fuel pushing device for pushing a fuel from a fuel supply port into a furnace, a grate for burning the pushed fuel, and a grate sliding device for reciprocating a movable stage constituting the grate. In the combustion furnace waste incinerator provided with, when increasing the fuel supply amount, the speed of at least one of the pushing motion of the fuel pushing device or the reciprocating motion of the grate sliding device is increased, and the fuel supply amount is increased. 2. The fuel supply amount according to claim 1, wherein when the fuel supply amount is reduced, at least one of a pushing movement of the fuel pushing device and a reciprocating mobility of the grate sliding device is reduced. The combustion method for a combustion furnace waste incinerator according to any one of claims 1 to 5. 7. A combustion furnace having a heat recovery unit for recovering heat from exhaust gas generated by fuel combustion to generate steam, a steam flow meter for measuring a steam flow rate of the heat recovery unit, and measuring an exhaust gas temperature. A temperature sensor to measure, from the measured value of the steam flow meter, to obtain a reference value of the exhaust gas temperature taking into account the delay of the time change of the steam flow with respect to the time change of the exhaust gas temperature, and compare the reference value and the measured value of the exhaust gas temperature And a fuel supply control device for controlling the fuel in the combustion furnace. 8. A temperature-time averaging processor for averaging the measured values of the temperature sensor over time, a value obtained by multiplying a deviation between a measured value of the steam flow meter and a predetermined set value by a gain. Is used as a reference value, a deviation between the measured value of the temperature sensor and the reference value is determined, and an upper and lower limit comparison is performed to compare the deviation with a predetermined judgment value. 8. The combustion device for a waste incinerator of a combustion furnace waste according to claim 7, further comprising a fuel cell, and a control device for controlling the fuel supply amount using an output value of the upper and lower limit comparator.