JP2016050710A - Dry distillation gasification incineration processing method for waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dry distillation gasification incineration processing method for waste capable of preventing dioxine and the like from being discharged without requiring any fuel such as heavy oil and capable of reducing its running cost.SOLUTION: Combustible gas generated by dry distillation of waste A in a dry distillation furnace 2a is fed into a combustion furnace 4 and ignited there, the waste A stored in a dry distillation furnace 2b is ignited when the combustible gas is being ignited at a set temperature to form a fire bed, oxygen of an amount capable of keeping the fire bed is supplied to the dry distillation furnace 2b. When a degree of opening of a valve 13a arranged at an oxygen supplying passage 10a reaches to a prescribed degree of opening, a dry distillation of the waste stored in the dry distillation furnace 2b is started, the generated combustible gas is fed into the combustion furnace 4 and burnt at a set temperature. When a degree of opening of the valve 13a arranged at the oxygen supplying passage 10a is being decreased and a degree of opening of a valve 13b arranged at an oxygen supplying passage 10b is being increased, feeding of the combustible gas generated in the dry distillation furnace 2a into the combustion furnace 4 is stopped.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for incinerating waste such as waste tires by dry distillation.

  As a method for incinerating waste such as waste tires, for example, a part of the waste stored in a dry distillation furnace is combusted, and the remainder of the waste is dry-distilled (pyrolysis) by the heat of combustion. There is known a method in which a combustible gas to be generated is introduced from a dry distillation furnace into a combustion furnace and burned (see, for example, Patent Document 1).

  In the method described in Patent Document 1, the combustion temperature of the combustible gas in the combustion furnace is detected, and the oxygen supply amount to the dry distillation furnace is adjusted so that the combustible gas is combusted at a predetermined set temperature. The dry distillation gasification of the waste in the dry distillation furnace is feedback controlled. Here, the amount of oxygen supplied to the distillation furnace is controlled by providing a valve in an oxygen supply path connecting the oxygen supply source and the distillation furnace and adjusting the opening of the valve.

  By the way, in recent years, when waste containing chlorine such as vinyl chloride is burned at a temperature of about 250 to 350 ° C., chlorine and hydrocarbons liberated from the waste react with a heavy metal contained in the waste as a catalyst. However, it has been pointed out that dioxins are produced. In the incineration of the waste, in order to prevent the discharge of the dioxins, it is effective to retain the waste at a temperature of 800 ° C. or higher for 2 seconds or more to completely thermally decompose the generated dioxins. It is said that.

  Therefore, in the treatment method described in Patent Document 1, it is considered that the discharge of the dioxins can be prevented by setting the combustion temperature of the combustible gas to 800 ° C. or higher.

  Further, since the incineration processing method is a batch process, for example, two of the distillation furnaces are provided for one of the combustion furnaces, and the two furnaces are operated alternately to perform continuous processing. A method is known (see, for example, Patent Document 2).

  In the treatment method described in Patent Document 2, the opening degree of the valve provided in the oxygen supply path for supplying oxygen to the first dry distillation furnace is fully opened at the end of the dry distillation of the waste in the first dry distillation furnace. Is reached, the waste in the second distillation furnace is ignited.

  Here, in the first dry distillation furnace, when the opening degree of the valve reaches about 90% of the full opening, the dry distillation of the waste is already completed and the generation of the combustible gas is almost eliminated. However, in the second dry distillation furnace, after the ignition, a fire bed is formed, and it still takes time until the generation of the combustible gas starts. As a result, if the combustion temperature of the combustible gas in the combustion furnace is lower than the set temperature, dioxins may be discharged.

  Therefore, in the processing method described in Patent Document 2, when the combustion temperature of the combustible gas in the combustion furnace falls below a preset temperature, fuel such as heavy oil is burned in the combustion furnace to The temperature is maintained at a preset temperature.

JP-A-2-135280 Japanese Patent No. 4050189

  However, in the conventional technology, in order to prevent discharge of dioxins, when the combustion temperature of the combustible gas in the combustion furnace is lower than a preset temperature, fuel such as heavy oil is required. There is an inconvenience that an increase in running cost is inevitable.

  The present invention eliminates such inconveniences, can prevent the discharge of dioxins without requiring fuel such as heavy oil, and can reduce the running cost of the dry distillation gasification incineration processing method. The purpose is to provide.

  In order to achieve such an object, the present invention comprises a plurality of dry distillation furnaces for one combustion furnace, and sequentially combusts waste contained in each of the dry distillation furnaces to generate a combustible gas, In the method of dry distillation gasification incineration of waste that introduces combustible gas into the combustion furnace and burns at a predetermined temperature set in advance, the waste stored in the first dry distillation furnace is supplied from the oxygen supply source to the first When combustible gas is produced by dry distillation using oxygen supplied to the first dry distillation furnace via one oxygen supply path, and the combustible gas is introduced into the combustion furnace and burned, Oxygen required for the dry distillation of the waste is controlled while controlling the opening of a valve provided in the first oxygen supply path so that the combustible gas burns at a predetermined temperature set in advance. The process of supplying to the second distillation furnace and the second distillation furnace to confirm that the waste is contained. And when the combustible gas is burned at a predetermined temperature preset in the combustion furnace, is supplied from the oxygen supply source to the second dry distillation furnace through the second oxygen supply path. Igniting the waste contained in the second dry distillation furnace using oxygen to form a firebed, and supplying the second amount of oxygen capable of maintaining the firebed from the oxygen source. A step of supplying the second dry distillation furnace via an oxygen supply path, and when the opening of a valve provided in the first oxygen supply path increases to reach a predetermined opening, the second Waste generated in the distillation furnace is subjected to dry distillation using oxygen supplied from the oxygen supply source to the second distillation furnace through the second oxygen supply path to start generation of combustible gas. And when the combustible gas generated in the second dry distillation furnace is introduced into the combustion furnace and burned, the combustible gas is set in advance. Supplying the oxygen necessary for dry distillation of the waste to the second distillation furnace while controlling the opening of a valve provided in the second oxygen supply path so as to burn at a temperature of The opening degree of the valve provided in the first oxygen supply path is decreasing at the end stage of the carbonization of the waste in the first distillation furnace, and the opening degree of the valve provided in the second oxygen supply path When the gas is increasing, the introduction of the combustible gas generated in the first dry distillation furnace into the combustion furnace is stopped.

  In the method of the present invention, first, the waste housed in the first distillation furnace is distilled using oxygen supplied from the oxygen supply source to the first distillation furnace through the first oxygen supply path. This generates flammable gas. Then, when the combustible gas is introduced into the combustion furnace and burned, the valve provided in the first oxygen supply path is opened so that the combustible gas burns at a predetermined temperature set in advance. The oxygen necessary for the dry distillation of the waste is supplied to the first dry distillation furnace while controlling the degree.

  Next, when the combustible gas generated in the first distillation furnace is combusted at a predetermined temperature set in advance, it is confirmed that waste is stored in the second distillation furnace. It detects and ignites the waste accommodated in the second distillation furnace to form a fire bed. The formation of the fire bed is performed using oxygen supplied from the oxygen supply source to the second dry distillation furnace through the second oxygen supply path. At this time, it is possible to immediately start to dry the waste in the second dry distillation furnace immediately after the formation of the fire bed, but at this time, the flammability is still caused by the dry distillation in the first dry distillation furnace. There remains enough waste to generate gas.

  Therefore, in the second distillation furnace, when the fire bed is formed, an amount of oxygen capable of maintaining the fire bed is supplied from the oxygen supply source through the second oxygen supply path. It is supplied to a dry distillation furnace so that it can be started at any time.

  During this time, in the first dry distillation furnace, the opening degree of the valve provided in the first oxygen supply path is controlled so that the combustible gas burns at a predetermined temperature set in advance. The opening of the valve gradually increases as the portion of the object that can dry up decreases. Therefore, when the opening of the valve provided in the first oxygen supply path increases to reach a predetermined opening, the waste stored in the second dry distillation furnace is removed from the oxygen supply source. The production of flammable gas is started by dry distillation using oxygen supplied to the second dry distillation furnace via the second oxygen supply path.

  If it does in this way, while the waste which can produce | generate the said combustible gas by dry distillation remains in the said 1st dry distillation furnace, the production | generation of this combustible gas in this 2nd dry distillation furnace will be started. be able to.

  Next, the combustible gas generated in the second dry distillation furnace is introduced into the combustion furnace to start combustion. At this time, similarly to the case where the combustible gas generated in the first dry distillation furnace is burned in the combustion furnace, the second combustible gas is burned at a predetermined temperature set in advance. While controlling the opening of a valve provided in the oxygen supply path, oxygen necessary for dry distillation of the waste is supplied to the second dry distillation furnace.

  Next, at the end of the dry distillation of the waste in the first dry distillation furnace, the opening of the valve provided in the first oxygen supply path is decreasing and provided in the second oxygen supply path. When the opening degree of the valve is increasing, the introduction of the combustible gas generated in the first dry distillation furnace into the combustion furnace is stopped. At this time, flammable gas is hardly generated in the first dry distillation furnace, but flammable gas is actively generated in the second dry distillation furnace.

  As a result, in the combustion furnace, the combustion of the combustible gas generated in the first dry distillation furnace is switched to the combustion of the combustible gas generated in the second dry distillation furnace. It can be avoided that the combustion temperature of the combustible gas falls below a preset temperature. Therefore, according to the method of the present invention, the discharge of dioxins can be prevented without requiring fuel such as heavy oil, and the running cost can be reduced.

  In the method of the present invention, it is sufficient that a plurality of the distillation furnaces are provided for one combustion furnace, and two or three or more furnaces may be provided. For example, two such distillation furnaces are provided. ing.

  In the method of the present invention, when the two distillation furnaces are provided for one combustion furnace, the waste in the second distillation furnace is ashed in the first distillation furnace when the waste in the second distillation furnace is distilled. After removing the waste, a step of newly storing the waste in the first dry distillation furnace, a step of detecting that the waste is stored in the first dry distillation furnace, and the second When the combustible gas generated in the dry distillation furnace is burning at a predetermined temperature set in advance in the combustion furnace, the first dry distillation from the oxygen supply source via the first oxygen supply path. Igniting the waste contained in the first dry distillation furnace using oxygen supplied to the furnace to form a firebed; and an amount of oxygen capable of maintaining the firebed from the oxygen supply source The step of supplying to the first dry distillation furnace through the first oxygen supply path and the opening of the valve provided in the second oxygen supply path are increased. When the predetermined opening degree is reached, oxygen stored in the first distillation furnace is supplied from the oxygen supply source to the first distillation furnace through the first oxygen supply path. And the step of starting the generation of combustible gas by using the above-described method, and alternately and repeatedly repeating the dry distillation of waste in the first dry distillation furnace and the second dry distillation furnace.

  In the method of the present invention, in the case where two units of the distillation furnace are provided with respect to one unit of the combustion furnace, the waste in the second furnace is being distilled while the waste in the first furnace is being distilled. The ashing of the waste ends. Therefore, when the waste in the second distillation furnace is dry-distilled, after the ashed waste in the first distillation furnace is removed, the waste is newly stored in the first distillation furnace. Prepare for the next dry distillation.

  In preparation for the next dry distillation, as in the case of the second dry distillation furnace, it is detected that waste is stored in the first dry distillation furnace, and the waste stored in the second dry distillation furnace is detected. This is done by igniting an object to form a firebed and ready to start dry distillation at any time.

  During this time, in the second distillation furnace, the opening degree of the valve provided in the second oxygen supply path is controlled so that the combustible gas burns at a predetermined temperature set in advance. The opening of the valve gradually increases as the portion of the object that can dry up decreases. Therefore, when the opening of the valve provided in the second oxygen supply passage increases to reach a predetermined opening, the waste stored in the first dry distillation furnace is removed from the oxygen supply source. The production of combustible gas is started by dry distillation using oxygen supplied to the first dry distillation furnace via the first oxygen supply path.

  In the method of the present invention, in the same manner, the combustion furnace and the first and second distillation furnaces are alternately repeated by alternately repeating the waste distillation in the first and second distillation furnaces. Can be operated continuously.

The system block diagram which shows the structure of the dry distillation gasification incineration processing apparatus used for the method of this invention. The graph which shows the time-dependent change of the combustion temperature in the combustion furnace of the combustible gas produced | generated in the 1st, 2nd distillation furnace, and the opening degree of the valve provided in the 1st, 2nd oxygen supply path.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings.

  The dry distillation gasification incineration processing method of this embodiment is implemented using the dry distillation gasification incineration processing apparatus 1 shown in FIG.

  The dry distillation gasification incineration processing apparatus 1 stores waste A such as waste tires, and performs gasification and ashing of the dry distillation gas 2 and two dry distillation furnaces 2a and 2b, and gas passages 3a and 3b to the dry distillation furnaces 2a and 2b. And a combustion furnace 4 connected to each other.

  Input ports 6a and 6b having input doors 5a and 5b that can be opened and closed are formed on the upper surface of the dry distillation furnaces 2a and 2b, respectively, and waste A can be input into the dry distillation furnaces 2a and 2b from the input ports 6a and 6b. It is said that. And in the state which closed the entrance doors 5a and 5b, the inside of the dry distillation furnaces 2a and 2b is cut off substantially from the outside. The dry distillation furnaces 2a and 2b may be provided with a measuring device (not shown) that measures a predetermined amount of waste A and inputs the waste A into the dry distillation furnaces 2a and 2b from the input ports 6a and 6b.

  A water jacket (not shown) isolated from the inside of the dry distillation furnaces 2a and 2b is formed as a cooling structure on the outer periphery of the dry distillation furnaces 2a and 2b. The water jacket is supplied with a water supply device (not shown) so that the amount of water inside is maintained at a predetermined water level.

  The bottoms of the distillation furnaces 2a and 2b are bottom doors 7a and 7b which can be moved downward. When the bottom doors 7a and 7b are closed, the inside of the drying furnaces 2a and 2b is substantially cut off from the outside. It has come to be. In the lower part of the bottom doors 7a and 7b, there are formed empty chambers 8a and 8b that are isolated from the inside of the dry distillation furnaces 2a and 2b. It communicates with the inside of the dry distillation furnace 2a, 2b via the air nozzles 9a, 9b.

  The dry distillation oxygen supply paths 10a and 10b are connected to the vacant chambers 8a and 8b below the dry distillation furnaces 2a and 2b, respectively. It is connected to a configured oxygen supply source 12. Control valves 13a and 13b are provided in the dry distillation oxygen supply paths 10a and 10b, respectively, and the opening degree of the control valves 13a and 13b is controlled by valve drivers 14a and 14b. In this case, the valve drivers 14a and 14b are controlled by the control device 15 configured by an electronic circuit including a CPU and the like.

  Further, ignition devices 16a and 16b for igniting the waste A stored in the dry distillation furnaces 2a and 2b are attached to the lower parts of the dry distillation furnaces 2a and 2b, respectively. The ignition devices 16a and 16b are configured by an ignition burner or the like, and waste is generated by burning the fuel supplied through the fuel supply paths 18a and 18b from the fuel supply devices 17a and 17b in which fuel such as light oil is stored. A is supplied with a combustion flame.

  The combustion furnace 4 combusts the burner part 19 which mixes the combustible gas produced by the dry distillation of the waste A and oxygen (air) necessary for the complete combustion, and the combustible gas mixed with oxygen (air). The combustion section 20 communicates with the burner section 19 on the downstream side of the burner section 19. The gas passages 3a and 3b are connected to the upstream side of the burner portion 19 via dampers 21a and 21b, respectively. The combustible gas generated by the dry distillation of the waste A in the drying furnaces 2a and 2b passes through the gas passages 3a and 3b. To the burner unit 19.

  A vacant chamber (not shown) that is isolated from the inside of the burner portion 19 is formed in the outer peripheral portion of the burner portion 19. ) To communicate with the inside of the burner unit 19. A combustion oxygen supply path 22 branched from the oxygen supply path 11 is connected to the vacant chamber. The combustion oxygen supply path 22 is arranged in the middle so as to pass through the combustion unit 20, and oxygen (air) preheated in the combustion unit 20 is supplied to the empty chamber.

  A control valve 23 is provided in the combustion oxygen supply path 22, and the opening degree of the control valve 23 is controlled by a valve driver 24. In this case, the valve driver 24 is controlled by the control device 15.

  A combustion device 25 is attached to the upstream side of the burner unit 19. The combustion device 25 includes an ignition burner or the like, and heats the combustion furnace 4 by burning the fuel supplied from the fuel supply device 26 in which fuel such as light oil is stored through the fuel supply path 27. The combustion device 25 is also used when igniting the combustible gas introduced into the burner unit 19.

  A hot water boiler 28 heated by combustion exhaust gas burned in the combustion furnace 4 is attached to the downstream side of the combustion unit 20. The hot water boiler 28 is supplied with water by a water supply device (not shown), and the hot water heated by using the combustion heat of the waste A can be used for air conditioning or the like.

  A duct 29 a for discharging combustion exhaust cooled by the hot water boiler 28 is provided on the outlet side of the hot water boiler 28, and the duct 29 a is connected to the upper end portion of the air-cooled heat exchanger 31 via the on-off valve 30. ing. The air-cooled heat exchanger 31 is supplied with air supplied from a not-shown pushing fan or the like, and cools the combustion exhaust by exchanging heat with the combustion exhaust introduced from the duct 29a. The combustion exhaust cooled by the air-cooled heat exchanger 31 is taken out by a duct 29b connected to the lower part of the air-cooled heat exchanger 31 via an on-off valve 32.

  On the other hand, a duct 29 c branches from the duct 29 a on the upstream side of the on-off valve 30, and the duct 29 c is connected to the upper end of the quenching tower 34 via the on-off valve 33. The quenching tower 34 includes a spray 35 that sprinkles and cools the combustion exhaust gas introduced from the duct 29c, and the spray 35 is connected to a water supply device (not shown) that supplies cooling water and an air compressor.

  The combustion exhaust gas cooled by the quenching tower 34 is taken out by a duct 29 d connected to the lower part of the quenching tower 34 via an opening / closing valve 36. The duct 29d joins the duct 29b on the downstream side of the on-off valves 32 and 36.

  The duct 29b is connected to one end of the bag filter 37, and the combustion exhaust gas introduced into the bag filter 37 from the duct 29b is mixed with slaked lime and activated carbon supplied from the chemical silo 38 to perform desulfurization and deodorization. Is called.

  The bag filter 37 includes a filter unit and a recovery unit that recovers ash and the like separated from combustion exhaust gas by the filter unit, and an air compressor (not shown) for cleaning the filter unit is connected to the filter unit. Yes. A duct 29 e is connected to the other end of the bag filter 37, and the duct 29 e is connected to the chimney 40 via an induction fan 39 that induces combustion exhaust in the combustion furnace 4.

  In addition, a duct 29 f that discharges combustion exhaust when the hot water boiler 28 is not used is provided on the downstream side of the combustion furnace 4, and the duct 29 f is connected to the duct 29 a via the on-off valve 41. Furthermore, in the dry distillation gasification incineration processing apparatus 1 of the present embodiment, the combustion furnace 4 is provided with a temperature sensor 42 for detecting the temperature T in the combustion furnace 4 at a position facing the downstream side of the burner unit 19. A detection signal from the temperature sensor 42 is input to the control device 15.

  Next, with reference to FIG.1 and FIG.2, the dry distillation gasification incineration processing method of this embodiment using the dry distillation gasification incineration processing apparatus 1 is demonstrated.

  When incinerating the waste A in the dry distillation gasification incineration apparatus 1, first, the charging door 5a of the dry distillation furnace 2a is opened with the bottom door 7a closed, and waste such as waste tires is opened from the charging port 6a. A is charged into the dry distillation furnace 2a. When the dry distillation furnace 2a is equipped with the weighing device, a predetermined amount of the waste A is measured by the weighing device and charged into the dry distillation furnaces 2a and 2b from the charging ports 6a and 6b.

Then, after the charged doors 5a closed by dry distillation furnace 2a and sealed, prior to ignition of the waste A, by operating the combustion device 25 of the combustion furnace 4 at time t ₀ shown FIG. 2, the fuel supply Warm-up operation by combustion of fuel supplied from the device 26 via the fuel supply path 27 is started.

Next, as shown in FIG. 2, when the temperature T in the combustion furnace 4 detected by the temperature sensor 42 gradually increases due to the combustion of the fuel and exceeds 700 ° C., for example, at time t ₁ , the controller 15 causes the dry distillation furnace. It is detected that the input of the waste A to 2a is completed and the waste A is stored in the dry distillation furnace 2a. And the damper 21a is opened and the ignition device 16a of the dry distillation furnace 2a is operated.

  The detection of the completion of the introduction of the waste A into the dry distillation furnace 2a is performed by, for example, providing a limit switch that is turned on when the charging door 5a and the bottom door 7a are closed, and detecting that the limit switch is ON. Can be done. Further, when the dry distillation furnace 2a includes the weighing device, the weighing device may be provided with a charged button and detecting the operation of the charged button. Furthermore, it may be performed by detecting that both the limit switches are ON and the operation of the inserted button.

  When it is detected by the control device 15 that the waste A has been charged into the dry distillation furnace 2a and the waste A is stored in the dry distillation furnace 2a, the waste is supplied from the fuel supply device 17a through the fuel supply path 18a. As a result, the waste A is ignited by the ignition device 16a and the partial combustion of the waste A is started.

  At the same time, the valve driver 14a is driven by the control device 15 so that the opening Aa of the control valve 13a is set to a predetermined opening, for example, 30%, from the oxygen supply source 12 through the oxygen supply path 11 and the dry distilled oxygen supply path 10a. Then, oxygen (air) is supplied to the dry distillation furnace 2a. As a result, in the dry distillation furnace 2a, partial combustion of the waste A is gradually expanded and stabilized by oxygen (air) supplied from the oxygen supply source 12, and a firebed is formed at the bottom of the waste A.

  When the fire bed is formed, the ignition device 16a is stopped, and the heat of the partial combustion of the waste A starts to dry the other part of the waste A, and the generation of combustible gas begins. Since the internal space of the dry distillation furnace 2a is sucked through the combustion furnace 4 by the induction fan 39, the combustible gas is introduced into the burner unit 19 through the gas passage 3a.

  In the burner unit 19, the valve driver 24 is driven by the control device 15 so that the opening degree of the control valve 23 is a predetermined opening degree, and oxygen is supplied from the oxygen supply source 12 through the oxygen supply path 11 and the combustion oxygen supply path 22. (Air) is supplied. Therefore, the combustible gas is mixed with oxygen (air) supplied via the combustion oxygen supply path 22 and ignited by the combustion flame supplied from the combustion device 25, and combustion in the combustion unit 20 is started. .

  Next, in the dry distillation furnace 2a, as shown in FIG. 2, the valve driver 14a is controlled by the control device 15 to increase the opening Aa of the control valve 13a stepwise. Occurrence is activated. Further, as the generation of the combustible gas becomes active, the combustion temperature T of the combustible gas in the combustion furnace 4 gradually increases.

The combustion temperature T of the combustible gas in the combustion furnace 4 slightly increases and decreases in the vicinity of 800 ° C. for a while, but eventually the combustible gas starts spontaneous combustion, and is set to a preset temperature (hereinafter, set temperature) at time t _2. For example, it reaches 850 ° C., which can reliably decompose dioxins. When the combustion temperature T of the combustible gas in the combustion furnace 4 reaches the set temperature, the combustion device 25 is stopped, and the control device 15 causes the combustion temperature T of the combustible gas in the combustion furnace 4 to reach the set temperature. The opening Aa of the control valve 13a is adjusted so as to be maintained, and the generation of the combustible gas in the dry distillation furnace 2a is feedback controlled.

  The combustion exhaust generated by the combustion of the combustible gas in the combustion unit 20 is cooled by exchanging heat with the water circulated in the hot water boiler 28 by the hot water boiler 28 and discharged to the duct 29a. Alternatively, the combustion exhaust gas is discharged to the duct 29a through the duct 29f without passing through the hot water boiler 28 by opening the on-off valve 41.

  When the combustion exhaust discharged to the duct 29 a passes through the hot water boiler 28, the combustion exhaust is introduced into the air-cooled heat exchanger 31 from the duct 29 a and exchanges heat with the air flowing through the air-cooled heat exchanger 31. Is further cooled and discharged to the duct 29b. At this time, the on-off valves 30 and 32 before and after the air-cooled heat exchanger 31 are opened, and the on-off valves 33 and 36 before and after the quenching tower 34 are closed.

  Further, when the combustion exhaust discharged to the duct 29a does not pass through the hot water boiler 28, the combustion exhaust is introduced into the quenching tower 34 from the duct 29c, cooled by the water that is sprayed from the spray 35, and passed through the duct 29d. And discharged to the duct 29b. At this time, the on-off valves 30 and 32 before and after the air-cooled heat exchanger 31 are closed, and the on-off valves 33 and 36 before and after the quenching tower 34 are opened.

  Next, the combustion exhaust discharged into the duct 29b is mixed with slaked lime and activated carbon supplied from the chemical silo 38, desulfurized and deodorized, and introduced into the bag filter 37 to remove ash, dust, etc. Released from the chimney 40 into the atmosphere.

When the feedback control of the generation of the combustible gas in the dry distillation furnace 2a is started (time t _2), as shown in FIG. 2, the opening Aa of the control valve 13a is temporarily reduced during the feedback control, With the progress of the dry distillation of the waste A in the dry distillation furnace 2a, it becomes larger again.

The incineration process of this embodiment, as shown in FIG. 2, after the combustion temperature T of the combustible gas in the combustion furnace 4 at time t ₂ has reached the set temperature, poured door 5b of the dry distillation furnace 2b Open and throw the waste A such as waste tire into the dry distillation furnace 2b from the charging port 6b. Then, the input is complete waste A to the dry distillation furnace 2b by the control unit 15, when it is detected that the waste material A is contained in the dry distillation furnace 2b, open the damper 21b, the dry distillation furnace at time t ₃ The ignition device 16b of 2b is operated. As a result, the waste A is ignited by the combustion of the fuel supplied from the fuel supply device 17b through the fuel supply path 18b, and the partial combustion of the waste A is started.

The control device 15 can detect that the input of the waste A to the dry distillation furnace 2b is completed and the waste A is stored in the dry distillation furnace 2b in the same manner as in the case of the dry distillation furnace 2a. The time t ₃ Later than time t _2, the generation of the combustible gas in the dry distillation furnace 2a may be any time as long as while being feedback-controlled.

  At this time, similarly to the case of the distillation furnace 2a, the valve driver 14b is controlled by the control device 15 so that the opening degree Ab of the control valve 13b is set to a predetermined opening degree, for example, 36%, and oxygen supply from the oxygen supply source 12 is performed. Oxygen (air) is supplied to the dry distillation furnace 2b through the passage 11 and the dry distillation oxygen supply passage 10b. As a result, in the dry distillation furnace 2b, partial combustion of the waste A is gradually expanded and stabilized by oxygen (air) supplied from the oxygen supply source 12, and a firebed is formed at the bottom of the waste A. When the fire bed is formed, the ignition device 16b is stopped.

  However, at this time, the dry distillation of the waste A is still in progress in the dry distillation furnace 2a, and the combustible gas is sufficiently generated. Therefore, if the firebed is formed in the dry distillation furnace 2b, the control device 15 throttles the opening Ab of the control valve 13b, for example, about 17% of the fully open state, and oxygen necessary and sufficient to maintain the firebed. Only (air) is supplied to the distillation furnace 2b. As a result, in the dry distillation furnace 2b, the fire bed is maintained, and the standby state where the generation of the combustible gas can be started by the dry distillation of the waste A at any time.

Then, at time t _4, the dry distillation furnace 2a predetermined opening degree Aa of the control valve 13a is increased, and if for example reaches 60 percent of the full open, the control unit 15 waste in the dry distillation furnace 2a A It is judged that it is almost time to complete the dry distillation process. As a result, the control device 15 drives the valve driver 14b to gradually increase the opening degree Ab of the control valve 13b, the dry distillation of the waste A in the dry distillation furnace 2b is started, and the generation of combustible gas starts.

  The combustible gas is introduced into the burner unit 19 through the gas passage 3b, and is mixed with oxygen (air) supplied from the oxygen supply source 12 through the oxygen supply passage 11 and the combustion oxygen supply passage 22 to form the combustion portion. 20 is burned. On the other hand, in the dry distillation furnace 2a, the opening Aa of the control valve 13a reaches the maximum value, for example, 70% of the full opening, with the decrease of the portion where the waste A can be dry-distilled, and thereafter, starts to decrease.

This time is the end stage of the dry distillation of the waste A in the dry distillation furnace 2a. Therefore, the opening degree Aa of the control valve 13a is further located diminishing, when the opening degree Ab of the control valve 13b is increasing, close the damper 21a at time t _5, the combustible gas produced by the dry distillation furnace 2b Only is introduced into the burner part 19. That is, the combustion of the combustible gas generated in the dry distillation furnace 2a is switched to the combustion of the combustible gas generated in the dry distillation furnace 2b.

  Thereafter, in the dry distillation furnace 2b, as in the case of the dry distillation furnace 2a, the controller 15 opens the opening of the control valve 13b so that the combustion temperature T of the combustible gas in the combustion furnace 4 is maintained at the set temperature. Ab is adjusted, and the generation of the combustible gas in the dry distillation furnace 2b is feedback-controlled.

  By doing in this way, in the incineration processing method of this embodiment, the combustion furnace 4 is also used when switching the combustion of the combustible gas generated in the dry distillation furnace 2a to the combustion of the combustible gas generated in the dry distillation furnace 2b. The combustion temperature T of the combustible gas in the inside does not fall below the set temperature. Therefore, the discharge of dioxins can be prevented without requiring fuel such as heavy oil or light oil, and the running cost can be reduced.

  In the dry distillation furnace 2a, after closing the damper 21a, the control device 15 maintains the opening Aa of the control valve 13a at a predetermined opening, for example, 50% of full opening, and the waste A is ashed. When the ashing of the waste A is completed, the bottom door 7a is lowered to discharge the ashed waste A, and then the bottom door 7a is returned to the original position. Then, the charging door 5a is opened, and waste A such as waste tires is charged into the dry distillation furnace 2a from the charging opening 6a to prepare for the next dry distillation.

  The next dry distillation in the dry distillation furnace 2a can be performed in the same manner as in the case of the dry distillation furnace 2b. Therefore, in the incineration processing method of the present embodiment, the dry distillation gasification incineration processing apparatus 1 is changed by alternately repeating the dry distillation of the waste A in the two dry distillation furnaces 2a and 2b with respect to one combustion furnace 4. It can be operated continuously.

  DESCRIPTION OF SYMBOLS 1 ... Dry distillation gasification incineration processing apparatus, 2a, 2b ... Dry distillation furnace, 4 ... Combustion furnace, 10a, 10b ... Oxygen supply path, 12 ... Oxygen supply source, 15 ... Control apparatus, A ... Waste.

Claims (3)

A single combustion furnace is provided with a plurality of distillation furnaces, and wastes stored in the respective distillation furnaces are sequentially distilled to generate a combustible gas, and the combustible gas is introduced into the combustion furnace in advance. In the dry distillation gasification incineration processing method of the waste that burns at the set predetermined temperature,
The waste housed in the first distillation furnace is distilled using oxygen supplied from the oxygen supply source to the first distillation furnace through the first oxygen supply path to generate a combustible gas. When the combustible gas is introduced into the combustion furnace and burned, the opening degree of the valve provided in the first oxygen supply path so that the combustible gas burns at a predetermined temperature set in advance. Supplying oxygen necessary for dry distillation of the waste to the first dry distillation furnace,
Detecting that waste is contained in the second distillation furnace;
When the combustible gas burns at a predetermined temperature set in advance in the combustion furnace, oxygen supplied from the oxygen supply source to the second dry distillation furnace through the second oxygen supply path Igniting the waste contained in the second dry distillation furnace to form a firebed,
Supplying an amount of oxygen capable of maintaining the fire bed from the oxygen supply source to the second dry distillation furnace via the second oxygen supply path;
When the opening degree of the valve provided in the first oxygen supply path increases to reach a predetermined opening degree, waste stored in the second dry distillation furnace is discharged from the oxygen supply source to the second A step of dry distillation using oxygen supplied to the second dry distillation furnace via an oxygen supply path of the gas to start generation of a combustible gas;
When the combustible gas generated in the second dry distillation furnace is introduced into the combustion furnace and burned, the second oxygen supply is performed so that the combustible gas burns at a predetermined temperature set in advance. Supplying oxygen necessary for dry distillation of the waste to the second dry distillation furnace while controlling the opening of a valve provided in the passage;
At the end of the dry distillation of the waste in the first distillation furnace, the opening of the valve provided in the first oxygen supply path is decreasing, and the valve provided in the second oxygen supply path is opened. A method for incinerating waste by gasification incineration, wherein the introduction of combustible gas generated in the first dry distillation furnace into the combustion furnace is stopped when the degree is increasing.   The waste carbonization incineration processing method according to claim 1, wherein the waste carbonization incineration processing method includes two of the carbonization furnaces for the one combustion furnace. In the method of dry distillation gasification incineration of waste according to claim 2, after the ashed waste in the first dry distillation furnace is removed during the dry distillation of the waste in the second dry distillation furnace, A step of newly storing waste in the first distillation furnace;
Detecting that waste is contained in the first dry distillation furnace;
When the combustible gas generated in the second dry distillation furnace is combusting at a predetermined temperature set in advance in the combustion furnace, the oxygen supply source passes through the first oxygen supply path. Igniting the waste contained in the first distillation furnace using oxygen supplied to the first distillation furnace to form a firebed;
Supplying an amount of oxygen capable of maintaining the fire bed from the oxygen supply source to the first dry distillation furnace via the first oxygen supply path;
When the opening degree of the valve provided in the second oxygen supply passage increases to reach a predetermined opening degree, the waste stored in the first dry distillation furnace is discharged from the oxygen supply source to the first oxygen source. A step of dry distillation using oxygen supplied to the first dry distillation furnace via the oxygen supply path of the gas to start generation of combustible gas,
A waste carbonization incineration method for waste, characterized by alternately repeating the carbonization of waste in the first and the second distillation furnace.