JP2013204996A - Treatment apparatus of organic waste, method for treating organic waste, and control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize a temperature distribution inside a post-combustion furnace in a treatment apparatus of organic wastes and to suppress clinker, NOx, and NO.SOLUTION: Dehydrated organic wastes 3 are supplied from a dry cake feeder 13 to a gasifying furnace 14. Pyrolysis gas generated by pyrolytically decomposing the organic wastes 3 in the gasifying furnace 14 is supplied to a post-combustion furnace 16 for combustion after a gasifying residue is separated via a cyclone 15. A temperature sensor 16a is provided inside the post-combustion furnace 16 to measure a temperature. A control part 30 computes a temperature deviation ΔT between a measurement temperature and a preset target temperature. When a computed temperature difference is not within a given temperature difference range, the control part 30 changes the number of revolutions of a motor 13a of the dry cake feeder 13 by the number of revolutions Δf which turns to the linear relationship for the temperature deviation ΔT. An input heat load, which corresponds to a combustible portion of the organic wastes 3 which are supplied from the dry cake feeder 13 to the gasifying furnace 14, is made constant.

Description

  The present invention relates to an organic waste processing apparatus for incinerating organic waste such as sewage sludge, and an organic waste processing method.

  Conventionally, gasification combustion systems have been adopted for incineration of organic waste such as sewage sludge. An organic waste processing apparatus such as this gasification combustion system includes a dryer, a gasification furnace, and a post-combustion furnace (heat recovery furnace). In this gasification combustion system, after the gasification furnace decomposes the organic waste into gasification residue and pyrolysis gas, the post-combustion furnace burns the pyrolysis gas.

For gasification combustion systems, from the viewpoint of environmental protection, the greenhouse effect represented by carbon dioxide (CO ₂ ) and nitrous oxide (N ₂ O), which has a greenhouse effect about 310 times that of CO _2. Reduction of gas and nitrogen oxides (NOx) is demanded.

  Patent Document 1 describes a combustion control device for a post-combustion furnace provided with a three-stage air blowing port for combusting pyrolysis gas obtained by pyrolyzing organic waste in a gasification furnace and injecting air. ing. In the combustion control apparatus described in Patent Document 1, the thermometer measures the furnace temperature in the vicinity of the three-stage air outlets, and based on the furnace temperature distribution shape derived from the furnace temperature of each stage, The amount of air blown from the air outlets at each stage is controlled.

JP 2010-065932 A

  However, in the control method described in Patent Document 1, it is necessary to obtain the temperature distribution in the secondary combustion furnace, and it is necessary to control the air amount at the three-stage air outlets based on the temperature distribution. Therefore, in order to stabilize the temperature in the secondary combustion furnace (post-combustion furnace), there has been a problem that the processing becomes very complicated.

  Further, according to the knowledge of the present inventor, in a gasification combustion system that incinerates organic waste such as sewage sludge, when the inside of the post-combustion furnace reaches 950 ° C. or higher, nitrogen (N ) -Derived NOx is prominent. Furthermore, when the temperature in the post-combustion furnace reaches 1000 ° C. or higher, the ash component in the organic waste is softened, resulting in clinker adhering to the wall of the post-combustion furnace, causing problems in continuous operation of the post-combustion furnace. There was a case. For this reason, in order to suppress the generation of NOx and the generation of clinker, it is desirable that the inside of the post-combustion furnace be at a relatively low temperature.

On the other hand, if the temperature in the post-combustion furnace is lowered while burning organic waste, N ₂ O derived from nitrogen contained in the organic waste is generated. Therefore, in order to suppress the production of N ₂ O, it is desirable to make the interior of the post-combustion furnace as high as possible.

In order to suppress N ₂ O generation while suppressing NOx generation and clinker generation, it is necessary to control the inside of the post-combustion furnace to a temperature range of 920 to 950 ° C. . Therefore, in the conventional gasification combustion system, by controlling the amount of auxiliary fuel used for heating the inside of the post-combustion furnace, the amount of combustion air, and the amount of cooling water, the temperature inside the post-combustion furnace is set to 920 to 950. I was trying to control it to be within the range of ° C.

  However, according to the knowledge of the present inventors, in the post-combustion furnace, temperature fluctuations are likely to occur due to the unstable nature of the organic waste to be treated supplied to the post-combustion furnace. For this reason, it is difficult to ensure temperature stabilization inside the post-combustion furnace, which hinders the operation of the gasification combustion system.

The present invention has been made in view of the above, and an object of the present invention is to stabilize the temperature fluctuation inside the post-combustion means provided in the organic waste treatment apparatus, and to reduce the nitrogen oxide (NOx). An object of the present invention is to provide an organic waste processing apparatus and an organic waste processing method capable of suppressing generation of nitrous oxide (N ₂ O) while suppressing generation and generation of clinker.

  In order to solve the above-described problems and achieve the above object, an organic waste processing apparatus according to the present invention includes a dehydrating means for performing a dehydrating process on an organic waste, and a dehydrated organic waste. A transport means for transporting an object, a gasification means for subjecting the organic waste transported from the transport means to pyrolysis to separate it into pyrolysis gas and solids, and heat supplied from the gasification means The post-combustion means for combusting the cracked gas and discharging the combustion gas, the temperature measurement means for measuring the temperature inside the post-combustion means, and the measurement temperature measured by the temperature measurement means can be input, A control means for calculating a temperature deviation of the measured temperature with respect to a preset target temperature, and for controlling the supply rate of the organic waste to the gasification means of the transport means based on the calculated temperature deviation; It is characterized by.

  In the organic waste processing apparatus according to the present invention, in the above invention, when the temperature deviation is out of a predetermined temperature deviation range, the control means determines the supply rate to the gasification means in the conveying means. Control is performed to change the supply speed immediately before the control so as to be within the predetermined temperature deviation range, and when the temperature deviation is within the predetermined temperature deviation range, the supply speed to the gasification means in the transport means is maintained. It is configured to perform control.

  In the organic waste processing apparatus according to the present invention, in the above invention, when the temperature deviation is outside the predetermined temperature deviation range, the control means determines the supply speed to the gasification means in the conveying means immediately before the control. The supply speed is controlled to change by a change amount having a linear relationship with respect to the temperature deviation.

  In the organic waste treatment apparatus according to the present invention, in the above invention, the control means is configured to supply the organic waste to the gasification means in the transport means when the temperature deviation is outside the predetermined temperature deviation range. Is controlled to decrease when the temperature deviation is positive, and is controlled to increase when the temperature deviation is negative.

  The organic waste processing apparatus according to the present invention, in the above invention, the temperature measuring means is a lower temperature measuring means for measuring the temperature below the center along the height direction inside the post-combustion means, An upper temperature measuring means for measuring the temperature of the upper part of the post-combusting means at a position higher than the temperature measuring means is further provided, and the control means is measured by the lower temperature and the upper temperature measuring means measured by the lower temperature measuring means. The upper temperature is configured to be input, and the temperature difference between the upper temperature and the lower temperature is calculated, and at least one of the upper temperature and the lower temperature is calculated so that the calculated temperature difference falls within a predetermined temperature difference range. It is comprised so that it may control.

  The organic waste processing method according to the present invention includes a dehydration step of performing a dehydration process on the organic waste, a transporting step of supplying the dehydrated organic waste to a subsequent stage of performing a thermal decomposition process, A gasification step in which the organic waste transported is pyrolyzed to separate it into pyrolysis gas and solids, and the pyrolysis gas separated in the gasification step is burned to discharge the combustion gas. Post-combustion step, temperature measurement step for measuring the temperature at the time of combustion in the post-combustion step, and calculating the temperature deviation of the temperature at the time of combustion measured in the temperature measurement step with respect to a preset target temperature at the time of combustion And a control step for controlling a supply speed at the time of transporting the organic waste to the subsequent stage based on the temperature deviation.

  In the organic waste processing method according to the present invention, in the above invention, when the control step is such that the temperature deviation is outside the predetermined temperature deviation range, the supply speed is set so that the temperature deviation falls within the predetermined temperature deviation range. And a control for maintaining the supply speed when the temperature deviation is within a predetermined temperature deviation range.

  In the organic waste processing method according to the present invention, in the above invention, when the control step has a temperature deviation outside a predetermined temperature deviation range, the supply rate is changed by a linear amount with respect to the temperature deviation. Only the control for changing the supply speed immediately before the control is performed.

  In the organic waste processing method according to the present invention, in the above invention, the control step is configured to decrease the supply rate when the temperature deviation is out of the predetermined temperature deviation range and when the temperature deviation is positive. And when the temperature deviation is negative, it is changed so as to increase.

  The organic waste treatment method according to the present invention is the above invention, wherein the temperature measurement step measures the temperature below the center along the height direction inside the post-combustion means in which the temperature measurement step performs the post-combustion step. And an upper temperature measurement step for measuring an upper temperature that is higher than the measurement position of the lower temperature in the lower temperature measurement step, and the control step measures the lower temperature and the upper temperature measured in the lower temperature measurement step. A temperature difference with the upper temperature measured in the temperature measurement step is calculated, and at least one of the upper temperature and the lower temperature is controlled so that the calculated temperature difference falls within a predetermined temperature difference range. .

  According to the organic waste processing apparatus and the organic waste processing method of the present invention, it is possible to stabilize the temperature fluctuation inside the post-combustion means provided in the organic waste processing apparatus, It becomes possible to suppress generation of nitrous oxide while suppressing generation of oxide and generation of clinker.

FIG. 1 is a configuration diagram illustrating an organic waste processing apparatus according to a first embodiment of the present invention. FIG. 2 is a flowchart for explaining the organic waste processing method including the control of the post-combustion furnace according to the first embodiment of the present invention. FIG. 3 is a graph showing an example of the control of the rotational speed of the dry cake feeder according to the temperature deviation in the post-combustion furnace according to the first embodiment of the present invention. FIG. 4 is a block diagram showing an organic waste processing apparatus according to the second embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. In all the drawings of the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Further, the present invention is not limited to the embodiments described below.

(First embodiment)
First, an organic waste processing apparatus according to a first embodiment of the present invention will be described. FIG. 1 shows a gasification combustion facility as an organic waste processing apparatus according to the first embodiment.

(Gasification combustion facility)
As shown in FIG. 1, the gasification combustion facility 1 includes a dryer 11, a conveyor 12, a dry cake feeder 13, a gasification furnace 14, a cyclone 15, a post-combustion furnace 16, a fluidized air preheater 17, and a dry gas preheater. 18, a combustion gas processing unit 19, and an exhaust cylinder 20, and a control unit 30 as control means for controlling them. Further, the gasification combustion facility 1 is provided with a cooling water tank 21 that constitutes a cooling liquid supply means for supplying cooling water as a cooling liquid to the gasification furnace 14 and the post-combustion furnace 16.

  When the organic waste 3 such as sewage sludge is input, the dryer 11 can dry the organic waste 3 using a dry gas of, for example, about 600 to 650 ° C. supplied from the dry gas preheater 18. It is the comprised dehydration processing means. The dryer 11 is configured to be able to supply the dried organic waste 3 to the transport conveyor 12. Further, the dryer 11 is configured to be able to supply the dry gas generated during drying to the dry gas preheater 18 by a fan 42b provided in a supply line to the dry gas preheater 18. Further, the dryer 11 is configured to be able to supply the dry gas generated during drying to the post-combustion furnace 16 by a fan 42 c provided in a supply line to the post-combustion furnace 16.

  The conveyor 12 is configured to be able to supply the organic waste 3 dried in the dryer 11 to the dry cake feeder 13.

  The dry cake feeder 13 provided at the rear stage of the transport conveyor 12 is a means for transporting the organic waste 3 by cutting out the dried organic waste 3 with a rotary feeder (not shown) and transporting it to the subsequent apparatus. It is composed. Further, the dry cake feeder 13 includes a motor 13a and an inverter 13b as driving means for rotationally driving a rotary feeder (not shown) provided inside. The rotational speed of the motor 13a is controlled by the control unit 30 via the inverter 13b based on the temperature inside the post-combustion furnace 16 described later. Thereby, in the dry cake feeder 13, the supply speed of the organic waste 3 supplied to the gasification furnace 14, which is a subsequent apparatus, is controlled by the control unit 30. Details of the rotation speed control of the motor 13a will be described later. The dry cake feeder 13 supplies the dried organic waste 3 to the gasification furnace 14 while the supply amount is controlled by the control unit 30.

  The gasification furnace 14 is gasification means composed of a fluidized bed furnace such as a circulating fluidized bed furnace or a bubble fluidized bed furnace. The gasification furnace 14 can thermally decompose the organic waste 3 supplied from the dry cake feeder 13 in a reducing atmosphere having an oxygen ratio of 1 or less using high-temperature air supplied from the fluidized air preheater 17. It is configured. As a result, in the gasification furnace 14, at least carbide and pyrolysis gas which are pyrolysis residues containing unburned carbon are generated from the organic waste 3. Moreover, by comprising the gasification furnace 14 from a fluidized bed furnace, the internal temperature can be changed in a relatively wide range of, for example, 450 to 850 ° C, preferably 600 to 800 ° C. Moreover, this gasification furnace 14 is provided with the temperature sensor 14a which consists of a some thermocouple, for example. The temperature sensor 14 a measures the temperature in the gasification furnace 14 and supplies it to the control unit 30.

  Further, cooling water is supplied from the cooling water tank 21 to the gasification furnace 14. The supply line from the cooling water tank 21 to the gasification furnace 14 is provided with a flow meter 43b and a valve 44b. The flow meter 43b outputs the flow rate value of the cooling water and supplies it to the control unit 30. The opening degree of the valve 44 b is controlled by the control unit 30. The control unit 30 controls the supply flow rate of the cooling water to the gasification furnace 14 by controlling the opening degree of the valve 44b based on the flow rate value supplied from the flow meter 43b.

The gasification furnace 14 is supplied with air, which is a gas containing oxygen (O ₂ ), by the fan 42a. A flow meter 43d and a valve 44d are provided in the supply line from the fan 42a to the gasification furnace 14 through the fluidized air preheater 17. The flow meter 43d measures the flow rate of the air flowing through the supply line and supplies it to the control unit 30. The opening degree of the valve 44d is controlled by the control unit 30. The control unit 30 controls the supply flow rate of air to the gasification furnace 14 by controlling the opening degree of the valve 44d based on the flow rate value supplied from the flow meter 43d.

  Thus, the control part 30 is comprised so that control of the temperature in the gasification furnace 14 is possible by controlling the supply flow rate of the cooling water and air supplied to the gasification furnace 14. The gasification furnace 14 includes a burner (not shown) that is a heating means using auxiliary fuel. This burner is controlled by the control unit 30. The control unit 30 controls the burner to heat the gasification furnace 14 and raise the gasification temperature.

  The cyclone 15 provided in the rear stage of the gasification furnace 14 is composed of, for example, an outer cylinder and an inner cylinder. The cyclone 15 is a separation and recovery means for separating and recovering the carbide 4 of the carbide and pyrolysis gas supplied from the gasification furnace 14. The collected carbide 4 is stored in, for example, a drum can. This carbide 4 can be used, for example, as an auxiliary fuel in an incinerator (not shown) attached to the gasification combustion facility 1 or as an auxiliary fuel in thermal power generation as an alternative to fossil fuel.

  A post-combustion furnace 16 that is a heat recovery furnace as post-combustion means is provided at the subsequent stage of the cyclone 15. The post-combustion furnace 16 is configured to discharge the pyrolysis gas supplied from the cyclone 15 from the upper side and burn it, and then discharge the combustion gas of, for example, about 900 ° C. from the lower side. After this, in the combustion furnace 16, a temperature sensor 16a comprising, for example, a plurality of thermocouples is provided as temperature measuring means or first temperature measuring means. The temperature sensor 16 a measures the combustion temperature in the post-combustion furnace 16 and supplies the measured value to the control unit 30.

  Further, the post-combustion furnace 16 is configured such that the cooling water supplied from the cooling water tank 21 flows from the upper side. A flow meter 43 a and a valve 44 a are provided on the supply line from the cooling water tank 21 to the post-combustion furnace 16. The flow meter 43 a outputs the flow value of the cooling water flowing through the supply line and supplies it to the control unit 30. The opening degree of the valve 44 a is controlled by the control unit 30. The control unit 30 controls the supply flow rate of the cooling water to the post-combustion furnace 16 by controlling the opening degree of the valve 44a based on the flow rate value supplied from the flow meter 43a.

  Further, the post-combustion furnace 16 is configured such that air having a temperature of, for example, about 20 ° C. is supplied by a fan 42d as gas supply means. A flow meter 43c and a valve 44c are provided in the supply line from the fan 42d to the post-combustion furnace 16. The flow meter 43 c outputs the flow value of the air flowing through the supply line and supplies it to the control unit 30. The opening degree of the valve 44 c is controlled by the control unit 30. The control unit 30 controls the supply flow rate of air to the post-combustion furnace 16 by controlling the opening degree of the valve 44c based on the flow rate value supplied from the flow meter 43c. Further, the post-combustion furnace 16 is configured such that a dry gas having a temperature of, for example, about 200 ° C. is supplied from the dryer 11.

  And the control part 30 controls the supply flow volume of the cooling water and air supplied to the post-combustion furnace 16 by PID control etc., for example based on the temperature in the post-combustion furnace 16 supplied from the temperature sensor 16a, The temperature in the post-combustion furnace 16 is adjusted. Further, the post-combustion furnace 16 is provided with a burner (not shown) that is a heating means using auxiliary fuel, for example, and the control unit 30 controls the burner to heat the inside of the post-combustion furnace 16 to a temperature. It is configured to be able to rise.

  The fluidized air preheater 17 provided at the rear stage of the post-combustion furnace 16 allows the combustion gas discharged from the post-combustion furnace 16 to pass therethrough and supplies it to the post-stage dry gas preheater 18, and the heat of the combustion gas is supplied to the fan. It is comprised so that it may move to the air supplied from 42a. The fluidized air preheater 17 supplies the air heated by the movement of heat to the gasification furnace 14 as fluidized air.

  The dry gas preheater 18 connected in series with the subsequent stage of the fluidized air preheater 17 passes the combustion gas supplied from the fluidized air preheater 17 and supplies it to the combustion gas processing unit 19 at the subsequent stage. The heat is transferred to the drying gas supplied from the dryer 11. The drying gas preheater 18 supplies the drying gas to which the heat has been transferred to the dryer 11. Thereby, the heat generated in the post-combustion furnace 16 can be circulated and used for drying the organic waste 3 in the dryer 11.

  The combustion gas processing unit 19 provided at the rear stage of the dry gas preheater 18 includes, for example, a combustion gas cooling tower, a combustion gas dust collector, and a combustion gas scrubber. The combustion gas processing unit 19 uses the combustion gas cooling tower to lower the temperature of the combustion gas using the air, and then removes the combustion ash from the combustion gas using the backwash air using the combustion gas dust collector, and the combustion gas scrubber removes the combustion gas. Remove harmful gases and fine particles from Further, the combustion gas processing unit 19 is configured to be able to supply the combustion gas whose temperature has decreased to the exhaust pipe 20 by the fan 42f. The exhaust cylinder 20 is an exhaust means for exhausting combustion gas.

  As described above, the gasification combustion facility 1 according to the first embodiment is configured. Next, in order to solve the above-mentioned problems related to the control of the post-combustion furnace in the treatment of organic waste in the gasification combustion facility 1 according to the first embodiment configured as described above. The present inventor has intensively studied. The outline will be described below.

  First, in the prior art, the control unit 30 controls the opening degree of the valve 44a based on the temperature in the post-combustion furnace 16 measured by the temperature sensor 16a in the post-combustion furnace 16 according to the first embodiment described above. The cooling water and air supplied into the post-combustion furnace 16 were adjusted. Thus, the control unit 30 performs, for example, PID control so that the temperature in the post-combustion furnace 16 is within a predetermined temperature range, specifically, for example, about 920 to 950 ° C.

  By the way, the present inventor examines the problem that the combustion temperature fluctuates in the post-combustion furnace 16, and pays attention to one of the causes that the property such as the moisture content in the organic waste 3 changes. did. That is, the present inventor considered that the temperature fluctuation in the post-combustion furnace 16 is one of the causes because the combustible content of the pyrolysis gas supplied from the cyclone 15 changes.

  Therefore, the present inventor has intensively studied to solve the problem of temperature fluctuation in the post-combustion furnace 16, and combustible components of the pyrolysis gas supplied to the post-combustion furnace 16, that is, organic waste such as dehydrated sludge. It has been recalled that temperature fluctuations in the post-combustion furnace 16 can be stabilized if the input heat load corresponding to the properties of the object can be made constant.

  And in order to make this input heat load constant, as a result of further various experiments and earnest studies by the present inventors, by controlling the dry cake feeder 13 in the front stage of the gasification furnace 14 that generates pyrolysis gas, And found that the input heat load is constant. Furthermore, when the inventor supplies the dried organic waste 3 to the gasification furnace 14 by the dry cake feeder 13, the inventor associates the driving of the dry cake feeder 13 with the temperature fluctuation in the post-combustion furnace 16. Recalled that is preferred.

  In addition, the inventor performs various experiments and studies to relate the driving of the dry cake feeder 13 to the temperature fluctuation in the post-combustion furnace 16, and measures the target temperature in the post-combustion furnace 16 set by the control unit 30. It is desirable to control the drive of the dry cake feeder 13 in correlation with the temperature deviation ΔT (measured temperature−target temperature) with respect to the temperature, and it has been found that a linear relationship is more desirable as this correlation. Furthermore, the present inventor has also found that in the drive control of the dry cake feeder 13, it is preferable not to change the drive state when the temperature deviation ΔT is within a predetermined range. The present invention has been devised based on the above experiments and intensive studies.

(Organic waste disposal method)
Next, the organic waste processing method according to the first embodiment and the accompanying dry cake feeder control method based on the above examination will be described. FIG. 2 is a flowchart showing the organic waste processing method according to the first embodiment.

  As shown in FIG. 2, in the organic waste processing method according to the first embodiment, first, in step ST1, an organic waste 3 such as sewage sludge is input to the dryer 11 from the outside. For example, it is dried in an atmosphere of 600 ° C. or higher. Then, the dried organic waste 3 is supplied to the dry cake feeder 13 as a conveyance means through the conveyance conveyor 12. Thereafter, the process proceeds to step ST2.

  In step ST2, the dried cake feeder 13 cuts the supplied organic waste 3 by a predetermined amount by rotating, for example, a rotating feeder (not shown in FIG. 1) by rotation of a motor 13a as a driving means. And transported to the gasification furnace 14. In addition, according to the rotation speed of the motor 13a of the dry cake feeder 13, the conveyance speed of the organic waste 3 also changes, and a supply flow rate also changes. Thereafter, the process proceeds to step ST3.

  In step ST3, the gasification furnace 14 performs thermal decomposition of the organic waste 3 supplied from the dry cake feeder 13. Thereby, the organic waste 3 is thermally decomposed into a pyrolysis gas and a carbide 4 which is a gasification residue. These pyrolysis gas and carbide 4 are supplied to the cyclone 15. Thereafter, the process proceeds to step ST4.

  In step ST <b> 4, the cyclone 15 separates and collects the carbide 4, and then supplies the separated pyrolysis gas of about 700 ° C. to the post-combustion furnace 16. Thereafter, the process proceeds to step ST5.

  In step ST5, the pyrolysis gas supplied to the post-combustion furnace 16 is burned while being mixed with the drying gas supplied from the dryer 11 by the fan 42c. At this time, if the combustible content of the pyrolysis gas supplied to the post-combustion furnace 16 changes, the temperature in the post-combustion furnace 16 also varies according to the change of the combustible content. In the first embodiment, As will be described later, the dried cake feeder 13 conveys the combustible portion of the pyrolysis gas so as to be within a predetermined range as much as possible. Thereafter, the process proceeds to step ST6.

  In step ST <b> 6, the temperature sensor 16 a measures the temperature in the post-combustion furnace 16 under the control of the control unit 30 and supplies the measured value to the control unit 30. In this way, the control unit 30 constantly monitors the in-furnace temperature of the post-combustion furnace 16. Thereafter, the process proceeds to step ST7.

In step ST7, the control unit 30 calculates a temperature deviation ΔT (ΔT = measured temperature−target temperature) from a preset target temperature based on the measured temperature in the post-combustion furnace 16. Further, the control unit 30 determines whether or not the temperature deviation ΔT is within the range of the predetermined temperature deviation ΔT ₀ . Specifically, the control unit 30 determines that the temperature deviation ΔT in the post-combustion furnace 16 is within a range of −10 ° C. or more and 10 ° C. or less when ΔT ₀ is 10 ° C., and the target temperature is 915 ° C., for example. Whether the measured temperature is 905 ° C. or higher and 925 ° C. or lower is determined. More preferably, the control unit 30 has a temperature deviation ΔT in the post-combustion furnace 16 in the range of −5 ° C. or more and 5 ° C. or less when ΔT ₀ is 5 ° C., and the target temperature is 925 ° C., for example. It is determined whether the measured temperature is 920 ° C. or higher and 930 ° C. or lower.

When the temperature deviation ΔT of the measured temperature with respect to the preset target temperature in the post-combustion furnace 16 is within the predetermined temperature deviation ΔT ₀ , that is, when the following equation (1) is satisfied (step ST7: Yes).
−ΔT ₀ ≦ ΔT ≦ ΔT ₀ (1)
Returning to step ST1, the organic waste processing in steps ST1 to ST7 is repeatedly performed. Steps ST1 to ST7 are executed in parallel in the gasification combustion facility 1.

On the other hand, when the temperature deviation ΔT in the post-combustion furnace 16 is outside the range of the predetermined temperature deviation ΔT ₀ , that is, when the following expression (2) or (3) is satisfied (step ST7: No), the process proceeds to step ST8. To do.
ΔT ₀ <ΔT (2)
ΔT <−ΔT ₀ (3)

  In step ST8, the control unit 30 changes the rotational speed of the motor 13a to the previous rotational speed via the inverter 13b based on the temperature deviation ΔT of the measured temperature with respect to the target temperature in the post-combustion furnace 16. I do. Thereby, the rotational speed of the rotary cutter of the dry cake feeder 13 is changed by the control unit 30 by a predetermined rotational speed with respect to the rotational speed immediately before the control. Along with this, the transport speed of the organic waste 3 supplied from the dry cake feeder 13 to the subsequent gasification furnace 14 is also changed with respect to the transport speed immediately before the control, and the flow rate is also changed with respect to the flow rate immediately before the control. Is done.

FIG. 3 is a graph showing a specific example of the rotational speed control of the motor 13 a of the dry cake feeder 13. As shown in FIG. 3, when the measured temperature in the post-combustion furnace 16 is higher than a predetermined temperature deviation ΔT _{0 with} respect to the target temperature and satisfies the above-described equation (2), the control unit 30 satisfies the above-described equation (2). The rotational speed f of the 13 motors 13a is decreased by the rotational speed Δf corresponding to the temperature deviation ΔT. When the temperature deviation ΔT becomes larger than the predetermined temperature deviation ΔT ₀ , the rotational speed f of the motor 13a is linearly decreased starting from the initial rotational speed variation −Δf ₀ . Thereby, the conveyance speed and flow rate of the organic waste 3 supplied to the gasification furnace 14 are decreased with respect to the conveyance speed and flow rate immediately before the control, respectively, and the combustible component to the gasification furnace 14 and the post-combustion furnace 16 is reduced. Reduce supply.

On the contrary, when the measured temperature in the post-combustion furnace 16 is lower than the predetermined temperature deviation ΔT _{0 with} respect to the target temperature and satisfies the above-described equation (3), the rotational speed of the motor 13a of the dry cake feeder 13 is set to the temperature. The difference ΔT is increased by the rotation number Δf. When the temperature difference ΔT becomes smaller than the predetermined temperature difference −ΔT ₀ , the rotational speed f of the motor 13a is increased linearly starting from the initial rotational speed variation Δf ₀ . Thereby, the conveyance speed and flow rate of the organic waste 3 supplied to the gasification furnace 14 are increased with respect to the conveyance speed and flow rate immediately before the control, respectively, and the combustible component to the gasification furnace 14 and the post-combustion furnace 16 is increased. Increase supply.

  In step ST8, the control unit 30 performs control to increase or decrease the rotational speed of the motor 13a of the dry cake feeder 13, and then rotates the motor 13a of the dry cake feeder 13 at the controlled rotational speed. Return to step ST1.

  And the control part 30 repeats step ST1-ST8 sequentially until the temperature deviation (DELTA) T with the target temperature of the measured temperature in the post-combustion furnace 16 satisfy | fills the above-mentioned (1) Formula in step ST7.

As described above, in the gasification combustion facility 1, organic disposal is performed while controlling the rotation speed of the motor 13a of the dry cake feeder 13 in accordance with the temperature deviation ΔT of the measured temperature with respect to the target temperature in the post-combustion furnace 16. The processing of the object 3 is continued. And when this inventor measured whether the temperature in the post-combustion furnace 16 became stable in the gasification combustion equipment 1 by this 1st Embodiment, it made it desirable in the whole region in the post-combustion furnace 16 It was confirmed that stable operation was possible within a temperature range, for example, within a temperature range of 920 to 950 ° C. Further, when N ₂ O and NOx were measured in the subsequent stage of the post-combustion furnace 16, it was confirmed that both of these concentrations were low, and it was possible to suppress the emission of greenhouse gases.

  According to the first embodiment of the present invention described above, the temperature in the post-combustion furnace 16 is measured, the temperature deviation from the target temperature is calculated, and the motor of the dry cake feeder 13 is determined according to the temperature deviation ΔT. Even when the property of the organic waste 3 is changed by changing the conveyance speed and flow rate of the organic waste 3 by increasing / decreasing the rotational speed of the 13a, the dry cake is changed according to the change of the property. Since the amount of the organic waste 3 supplied from the feeder 13 to the gasification furnace 14 can be adjusted to adjust the combustible amount supplied to the post-combustion furnace 16, the gasification furnace 14 and the post-combustion furnace 16 can be adjusted. The input heat load can be adjusted so that the input heat load is within a predetermined range, preferably substantially constant. Thus, the combustion temperature in the post-combustion furnace 16 can be stabilized within a desired temperature range, and the post-combustion furnace 16 can be stably operated. Further, when the control for changing the rotational speed of the motor 13a of the dry cake feeder 13 is performed, the dry cake feeder 13 is gasified by increasing or decreasing the rotational speed corresponding to the temperature deviation ΔT from the rotational speed immediately before the control. The conveyance speed and flow rate of the organic waste 3 supplied to the furnace 14 can be finely adjusted according to the properties of the organic waste 3.

(Second Embodiment)
Next, an organic waste processing apparatus according to a second embodiment of the present invention will be described. FIG. 4 shows a gasification combustion facility 2 according to the second embodiment.

(Gasification combustion facility)
As shown in FIG. 4, in the gasification combustion facility 2 according to the second embodiment, for example, a plurality of thermocouples as second temperature measuring means are disposed above the temperature sensor 16 a inside the post-combustion furnace 16. A temperature sensor 16b is provided. And while the temperature sensor 16a is provided below the center along the height direction in the post-combustion furnace 16, the temperature sensor 16b is above the temperature sensor 16b and closer to the pyrolysis gas supply side. Is provided.

  The temperature sensor 16a measures the combustion temperature (lower temperature) in the lower part of the post-combustion furnace 16, and the temperature sensor 16b measures the combustion temperature (upper temperature) in the upper part of the post-combustion furnace 16. The control unit 30 is supplied with the measured value of the lower temperature from the temperature sensor 16a and the measured value of the upper temperature from the temperature sensor 16b. The control unit 30 is configured to be able to control the flow rate of at least one of air and cooling water supplied to the post-combustion furnace 16 based on the difference between the supplied lower temperature and upper temperature.

  Further, the interval between the temperature sensor 16 a and the temperature sensor 16 b is appropriately determined according to dimensions such as the height inside the post-combustion furnace 16. That is, it is desirable that the upper temperature sensor 16 b be provided near the supply portion of the combustion air containing the dry gas supplied from the dryer 11. Further, it is desirable that the lower temperature sensor 16a is provided at a position lower than the position of the lowermost supply portion of the supply portions of the combustion air, which is a portion where all the combustion air has been supplied. This is because the temperature for each region changes in the post-combustion furnace 16 depending on the amount of combustion air input and the amount of heat held by the pyrolysis gas. Since other configurations are the same as those in the first embodiment, description thereof is omitted.

(Organic sludge treatment method)
Next, the organic sludge treatment method in the second embodiment will be described. That is, the control unit 30 determines that the temperature difference Δθ is predetermined based on the temperature difference Δθ between the lower temperature supplied from the temperature sensor 16a and the upper temperature supplied from the temperature sensor 16b (= upper temperature−lower temperature). In the temperature range of 10 to 30 ° C., preferably in the temperature range of 10 to 30 ° C., preferably in a temperature range of 10 to 30 ° C. 16 controls the upper temperature in the interior. The upper temperature in the post-combustion furnace 16 is controlled by controlling the opening of the valve 44a in the supply line from the cooling water tank 21 to the post-combustion furnace 16, or the valve 44c in the supply line from the fan 42d to the post-combustion furnace 16. Or by controlling the opening of

  Specifically, the control unit 30 first performs control such as PID control so that the lower temperature falls within a predetermined temperature range, and when the upper temperature is higher than the lower temperature by a temperature difference Δθ or more, The upper temperature is lowered by increasing the flow rate of cooling water or decreasing the flow rate of air. On the other hand, the control unit 30 controls the lower temperature so as to be within a predetermined temperature range, and when the upper temperature is lower than the lower temperature by a temperature difference Δθ or more, the control unit 30 reduces the flow rate of the cooling water or reduces the air flow. The upper temperature is increased by increasing the flow rate. Thus, the control unit 30 controls the amount of heat supplied to the post-combustion furnace 16 so that the temperature in the post-combustion furnace 16 is 850 ° C. or higher and a predetermined temperature or lower, specifically, for example, 920 ° C. or higher and 950 ° C. or lower. To control. Since other organic sludge treatment methods are the same as those in the first embodiment, the description thereof is omitted.

  According to the gasification combustion facility 2 according to the second embodiment, the temperature difference Δθ between the upper part and the lower part in the post-combustion furnace 16 is calculated, and the lower temperature range is controlled within a predetermined temperature range. By controlling at least one of the flow rate of the cooling water supplied to the post-combustion furnace 16 and the flow rate of air so that the temperature difference Δθ is within the predetermined temperature difference range, preferably the predetermined temperature difference, the post-combustion furnace The generation of a local high-temperature region can be suppressed in the entire region inside 16, and the post-combustion furnace 16 can be operated more stably.

  As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, Various deformation | transformation based on the technical idea of this invention is possible. For example, the numerical values given in the above embodiment are merely examples, and different numerical values may be used as necessary.

  In the first embodiment described above, the gasification furnace 14 is composed of a fluidized bed furnace. However, the gasification furnace 14 is not necessarily limited to a fluidized bed furnace as long as it is capable of changing a relatively wide range of temperatures. Instead, it is also possible to employ a furnace such as a rotary kiln.

  In the first embodiment described above, a cyclone is employed as the separation and recovery means, but other separation and recovery devices capable of separating and recovering carbides such as a ceramic filter can also be employed.

In the first embodiment described above, the predetermined temperature deviation range of the temperature deviation ΔT is set to −ΔT ₀ (K) or more and ΔT ₀ (K) or less, and the absolute value between the lower limit and the upper limit of the predetermined temperature deviation range is set. Although it is the same, it is not necessarily limited to the same, and the absolute value of the lower limit and the upper limit of the predetermined temperature deviation range may be different numerical values.

  Further, in the first embodiment described above, the flow rate of air supplied to the post-combustion furnace 16 by controlling the opening of the valve 44c so that the temperature in the post-combustion furnace 16 falls within a predetermined temperature range. It is also possible to control, control the flow rate of the cooling water supplied to the post-combustion furnace 16 by controlling the opening of the valve 44a, or heat by a burner (not shown).

In the first embodiment described above, the rotation speed f of the motor 13a of the dry cake feeder 13 is rotated linearly with respect to the temperature deviation ΔT when the temperature deviation ΔT is outside the range of the predetermined temperature deviation ΔT _0. Although the change is made by the number difference Δf, it is not necessarily limited to a linear relationship, and the rotational speed is increased or decreased by various relationships based on the structure of the post-combustion furnace 16 or the type of the dry cake feeder 13. It is possible to make it. For example, in the graph shown in FIG. 3, the linear relationship portion may be increased or decreased stepwise. In this case, the absolute value of the rotational speed decrease Δf increases or decreases as the temperature deviation ΔT increases as a positive number, and the rotational speed increases as the temperature deviation ΔT decreases as the absolute value increases as a negative number. The absolute value of the minute Δf is constant or increases.

  In the second embodiment described above, the control unit 30 adjusts the lower temperature in the post-combustion furnace 16 by, for example, control such as PID control, and the difference between the upper temperature and the lower temperature is within a predetermined temperature difference range. The adjustment is made so as to be within the range, but is not necessarily limited to this method. For example, the control unit 30 adjusts the lower temperature so that the temperature difference Δθ from the upper temperature falls within a predetermined temperature difference range while adjusting the upper temperature in the post-combustion furnace 16 by control such as PID control. Is also possible.

  In the second embodiment described above, the temperature difference Δθ between the upper part and the lower part in the post-combustion furnace 16 is a positive number. However, when Δθ is a negative number, that is, the upper temperature is lower than the lower temperature. Similar control can be performed even when the temperature is low.

  Moreover, in the above-mentioned embodiment, although this invention is applied to the gasification combustion equipment, it is not necessarily limited to a gasification combustion equipment, It is also possible to apply to a carbonization system. Further, the post-combustion means is not limited to the post-combustion furnace, and a combustion boiler can be adopted.

DESCRIPTION OF SYMBOLS 1, 2 Gasification combustion equipment 3 Organic waste 4 Carbide 11 Dryer 12 Conveyor 13 Dry cake feeder 13a Motor 13b Inverter 14 Gasification furnace 14a, 16a, 16b Temperature sensor 15 Cyclone 16 Post-combustion furnace 17 Fluidized air preheater DESCRIPTION OF SYMBOLS 18 Dry gas preheater 19 Combustion gas processing part 20 Exhaust pipe 21 Cooling water tank 30 Control part 42a, 42b, 42c, 42d, 42f Fan 43a, 43b, 43c, 43d Flowmeter 44a, 44b, 44c, 44d Valve

The present invention includes a processing unit of the organic waste incinerating organic waste such as sewage sludge, the method of treating organic waste, and a control device.

The present invention has been made in view of the above, and an object of the present invention is to stabilize the temperature fluctuation inside the post-combustion means provided in the organic waste treatment apparatus, and to reduce the nitrogen oxide (NOx). An organic waste processing apparatus , an organic waste processing method , and a control apparatus capable of suppressing generation of nitrous oxide (N ₂ O) while suppressing generation and generation of clinker. .

In order to solve the above-described problems and achieve the above object, an organic waste processing apparatus according to the present invention includes a dehydrating means for performing a dehydrating process on an organic waste, and a dehydrated organic waste. A transport means for transporting an object, a gasification means for subjecting the organic waste transported from the transport means to pyrolysis to separate it into pyrolysis gas and solids, and heat supplied from the gasification means Post-combustion means for burning cracked gas and discharging combustion gas, lower temperature measuring means for measuring the temperature below the center along the height direction inside the post-combustion means, and lower temperature inside the post-combustion means the upper temperature measuring means for measuring the temperature of the top of the higher measuring means position, and can be input as a lower temperature measured by the lower temperature measurement means, the lower the temperature, the temperature deviation with respect to a preset target temperature Calculate Based on the calculated temperature deviation, controls the feed rate of organic waste to the gasification unit of the conveying means, it can be input constituting an upper temperature measured by the lower temperature and the upper temperature measuring means, the upper And a control means for calculating a temperature difference between the temperature and the lower temperature and controlling at least one of the upper temperature and the lower temperature so that the temperature difference falls within a predetermined temperature difference range .

The organic waste processing method according to the present invention includes a dehydration step of performing a dehydration process on the organic waste, a transporting step of supplying the dehydrated organic waste to a subsequent stage of performing a thermal decomposition process, A gasification step in which the organic waste transported is pyrolyzed to separate it into pyrolysis gas and solids, and the pyrolysis gas separated in the gasification step is burned to discharge the combustion gas. A post-combustion step, a lower temperature measurement step for measuring the temperature below the center along the height direction inside the post-combustion means for performing the post-combustion step, and a position higher than the measurement position of the lower temperature in the lower temperature measurement step the upper temperature measuring step of measuring the temperature of the upper is, the temperature-polarized with respect to the lower temperature at the time of combustion measured at the lower temperature measuring step, with respect to a target temperature at the time of combustion a preset Is calculated, and based on the temperature deviation, controls the feed speed at the time of conveyance to the subsequent organic waste in the transport step, measured at the lower temperature and the upper temperature measuring step measured at the lower temperature measuring step And a control step of calculating a temperature difference from the upper temperature and controlling at least one of the upper temperature and the lower temperature so that the temperature difference falls within a predetermined temperature difference range .

The control device according to the present invention includes a dehydration processing unit that performs a dehydration process on organic waste, a transport unit that transports the dehydrated organic waste, and an organic waste transported from the transport unit. Gasification means for performing pyrolysis treatment to separate pyrolysis gas and solids, post-combustion means for burning the pyrolysis gas supplied from the gasification means and discharging the combustion gas, A lower temperature measuring means for measuring the temperature below the center along the height direction in the interior, and an upper temperature measuring means for measuring the temperature of the upper part at a position higher than the temperature measuring means inside the post-combustion means. A control device for controlling an organic waste treatment device, configured to be able to input a lower temperature measured by a lower temperature measuring means, and calculating a temperature deviation of the lower temperature with respect to a preset target temperature. Calculate Based on the temperature deviation, controls the feed rate of organic waste to the gasification unit of the conveying means, which can be input constituting the upper temperature measured by the lower temperature and upper temperature measuring means, and the upper temperature A temperature difference from the lower temperature is calculated, and at least one of the upper temperature and the lower temperature is controlled so that the temperature difference falls within a predetermined temperature difference range.

According to the organic waste processing apparatus , the organic waste processing method , and the control apparatus according to the present invention, it is possible to stabilize the temperature fluctuation inside the post-combustion means provided in the organic waste processing apparatus. It is possible to suppress the generation of nitrous oxide while suppressing the generation of nitrogen oxides and the generation of clinker.

In order to solve the above-described problems and achieve the above object, an organic waste processing apparatus according to the present invention includes a dehydrating means for performing a dehydrating process on an organic waste, and a dehydrated organic waste. A transport means for transporting an object, a gasification means for subjecting the organic waste transported from the transport means to pyrolysis to separate it into pyrolysis gas and solids, and heat supplied from the gasification means Post-combustion means for burning cracked gas and discharging combustion gas, lower temperature measuring means for measuring the temperature below the center along the height direction inside the post-combustion means, and lower temperature inside the post-combustion means The upper temperature measuring means for measuring the upper temperature above the measuring means, the lower temperature measured by the lower temperature measuring means, and the upper temperature measured by the upper temperature measuring means can be input , and the lower temperature can be input. In advance Calculating a temperature deviation of the constant is the target temperature, based on the calculated temperature deviation, controls the feed rate of organic waste to the gasification unit of the conveying means, calculates a temperature difference relative to the lower temperature of the upper temperature And a control means for controlling a supply flow rate of at least one of cooling water and air supplied to the post-combustion means so that the temperature difference falls within a predetermined temperature difference range.

The organic waste processing method according to the present invention includes a dehydration step of performing a dehydration process on the organic waste, a transporting step of supplying the dehydrated organic waste to a subsequent stage of performing a thermal decomposition process, A gasification step in which the organic waste transported is pyrolyzed to separate it into pyrolysis gas and solids, and the pyrolysis gas separated in the gasification step is burned to discharge the combustion gas. A post-combustion step, a lower temperature measurement step for measuring the temperature below the center along the height direction inside the post-combustion means for performing the post-combustion step, and a position higher than the measurement position of the lower temperature in the lower temperature measurement step The temperature difference between the upper temperature measurement step for measuring the upper temperature and the lower temperature during combustion measured in the lower temperature measurement step with respect to a preset target temperature during combustion. Is calculated, and based on the temperature deviation, controls the feed speed at the time of conveyance to the subsequent organic waste in the transport step, the upper temperature measured at the upper temperature measuring step, measured at the lower temperature measuring step Calculating a temperature difference with respect to the lower temperature, and controlling a supply flow rate of at least one of cooling water and air supplied to the post-combustion means so that the temperature difference falls within a predetermined temperature difference range. Features.

The control device according to the present invention includes a dehydration processing unit that performs a dehydration process on organic waste, a transport unit that transports the dehydrated organic waste, and an organic waste transported from the transport unit. Gasification means for performing pyrolysis treatment to separate pyrolysis gas and solids, post-combustion means for burning the pyrolysis gas supplied from the gasification means and discharging the combustion gas, A lower temperature measuring means for measuring the temperature below the center along the height direction in the interior, and an upper temperature measuring means for measuring the temperature of the upper part at a position higher than the temperature measuring means inside the post-combustion means. a control device for controlling the processing unit of the organic waste, can be input constituting an upper temperature measured by the lower temperature and the upper temperature measuring means which is measured by the lower temperature measurement means, the lower the temperature, pre Set Calculating a temperature deviation from the target temperature, based on the calculated temperature deviation, controls the feed rate of organic waste to the gasification unit of the conveying means, and calculates the temperature difference relative to the lower temperature of the upper temperature, The supply flow rate of at least one of cooling water and air supplied to the post-combustion means is controlled so that the temperature difference falls within a predetermined temperature difference range.

Claims (10)

Dehydration treatment means for dehydrating organic waste,
Conveying means for conveying dehydrated organic waste;
Gasification means for performing pyrolysis treatment on the organic waste conveyed from the conveyance means to separate it into pyrolysis gas and solid content,
Post-combustion means for combusting the pyrolysis gas supplied from the gasification means to discharge combustion gas;
Temperature measuring means for measuring the temperature inside the post-combustion means;
The measurement temperature measured by the temperature measurement means is configured to be input, and a temperature deviation of the measurement temperature with respect to a preset target temperature is calculated. Based on the calculated temperature deviation, the conveyance means Control means for controlling the supply rate of the organic waste to the gasification means;
An organic waste treatment apparatus comprising:   When the temperature deviation is outside the predetermined temperature deviation range, the control means sets the supply speed of the transport means to the gasification means immediately before the control so that the temperature deviation is within the predetermined temperature deviation range. Control is performed to change the supply speed, and control is performed to maintain the supply speed to the gasification means in the transport means when the temperature deviation is within the predetermined temperature deviation range. The organic waste processing apparatus according to claim 1, wherein:   When the temperature deviation is out of a predetermined temperature deviation range, the control means has a linear relationship with respect to the temperature deviation with respect to the supply speed to the gasification means in the transport means with respect to the supply speed immediately before the control. The organic waste processing apparatus according to claim 2, wherein the control unit is configured to perform control to change only the amount of change.   The control means reduces the supply rate of the organic waste to the gasification means in the transport means when the temperature deviation is outside a predetermined temperature deviation range, when the temperature deviation is positive. 4. The organic waste treatment apparatus according to claim 2, wherein the control is performed so that the temperature deviation is increased when the temperature deviation is negative.   The temperature measuring means is a lower temperature measuring means for measuring a temperature below the center along the height direction inside the post-combustion means, and an upper portion at a position higher than the temperature measuring means inside the post-combustion means. And further comprising an upper temperature measuring means for measuring the temperature of the lower temperature measured by the lower temperature measuring means and an upper temperature measured by the upper temperature measuring means. A temperature difference between the upper temperature and the lower temperature is calculated, and at least one of the upper temperature and the lower temperature is controlled so that the calculated temperature difference falls within a predetermined temperature difference range. The organic waste processing apparatus according to any one of claims 1 to 4, wherein the organic waste processing apparatus is provided. A dehydration step for dehydrating organic waste;
A transporting step of supplying the dehydrated organic waste to a subsequent stage for performing a pyrolysis treatment;
A gasification step in which pyrolysis treatment is performed on the conveyed organic waste to separate it into pyrolysis gas and solid content;
A post-combustion step in which the pyrolysis gas separated in the gasification step is combusted to discharge the combustion gas;
A temperature measurement step for measuring the temperature during combustion in the post-combustion step;
A temperature deviation of the temperature at the time of combustion measured in the temperature measurement step with respect to a preset target temperature at the time of combustion is calculated, and based on the calculated temperature deviation, to the subsequent stage of the organic waste in the conveying step A control step for controlling the supply speed at the time of conveyance;
A method for treating organic waste, comprising:   In the control step, when the temperature deviation is outside a predetermined temperature deviation range, control is performed to change the supply speed so that the temperature deviation is within the predetermined temperature deviation range, and the temperature deviation is The organic waste processing method according to claim 6, wherein control is performed to maintain the supply rate when the temperature is within a predetermined temperature deviation range.   In the control step, when the temperature deviation is outside the predetermined temperature deviation range, the supply speed is changed with respect to the supply speed immediately before the control by a change amount having a linear relationship with the temperature deviation. The organic waste processing method according to claim 7, wherein:   In the control step, when the temperature deviation is outside the predetermined temperature deviation range, the supply speed is changed to decrease when the temperature deviation is positive, and when the temperature deviation is negative It changes so that it may increase, The processing method of the organic waste of Claim 7 or 8 characterized by the above-mentioned.   The temperature measuring step is a lower temperature measuring step for measuring the temperature below the center along the height direction inside the post-combustion means for performing the post-combustion step, and the temperature of the lower portion in the lower temperature measuring step is measured. It further includes an upper temperature measurement step for measuring an upper temperature that is higher than the measurement position, and the control step is a temperature between the lower temperature measured in the lower temperature measurement step and the upper temperature measured in the upper temperature measurement step. The difference is calculated, and at least one of the upper temperature and the lower temperature is controlled so that the calculated temperature difference falls within a predetermined temperature difference range. 2. A method for treating organic waste according to item 1.

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