JP2013257065A - Waste incinerator, and method of incinerating waste - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste incinerator and a method allowing low air ratio combustion.SOLUTION: A waste incinerator includes a main combustion chamber 11 for burning a waste fed from a waste feed inlet 13, with a secondary combustion chamber 12 connected to an outlet side of the main combustion chamber 11, to burn unburnt gas after the burning in the main combustion chamber 11, and is provided with a drying fire grate 11a, a combustion fire grate 11b, and an after-combustion fire grate 11c sequentially in a main combustion chamber 11 lower part, and further with a primary air supply means 21 for supplying primary air from respective under sides of the drying fire grate 11a and the combustion fire grate 11b. In the waste incinerator, a high-temperature air supply means 25 is provided to supply 100-200°C of high-temperature air from an under side of the after-combustion fire grate, and the high-temperature air is supplied to the secondary combustion chamber 12 through the main combustion chamber 11.

Description

  The present invention relates to a grate-type waste incinerator and a waste incineration method for incinerating waste such as municipal waste.

  A grate-type waste incinerator is widely used as an incinerator for incinerating waste such as municipal waste, and a schematic configuration of a typical one is shown in FIG. 2 of the accompanying drawings. This type of incinerator of FIG. 2 is also disclosed in Patent Document 1.

  The incinerator shown in FIG. 2 is a three-stage grate (dry grate 1a, combustion grate 1b, and post-combustion grate) disposed in the moving direction of the waste at the lower part of the main combustion chamber 1 for burning the waste 1c), and a secondary combustion chamber 2 is connected to the outlet of the main combustion chamber 1 located above the post-combustion grate 1c. The main combustion chamber 1 is provided with a waste charging port 3 located above the dry grate 1a and an ash drop port 4 at the lower right of the rear combustion grate 1c. Usually, the secondary combustion chamber 2 is also a part of the waste heat boiler 10 for recovering waste heat and is in the vicinity of the inlet. The main combustion chamber 1 has a secondary air inlet through which secondary air from outside is blown into the main combustion chamber 1 at a position above the grate within a range extending over the combustion grate 1b and the post-combustion grate 1c. 5 is provided.

  In the incinerator shown in FIG. 2, the waste introduced into the furnace through the waste inlet 3 is deposited on the dry grate 1a through the chute 3a, and the air from below the dry grate 1a While being dried by the radiant heat in the furnace, it is heated to ignite. That is, immediately above the dry grate 1a, a dry region is formed in the left region space upstream of the waste flow direction, and a combustion start region is formed in the right region space downstream. The waste that ignites in the combustion start region and starts combustion is sent onto the combustion grate 1b, and the waste is pyrolyzed and gasified to generate a combustible gas, which is sent from below the combustion grate 1b. Gas and solid content are combusted by the primary air to form a main combustion region in the space immediately above the combustion grate 1b. Further, on the post-combustion grate 1c, unburned components such as fixed carbon are completely burned by the primary air for combustion sent from below the post-combustion grate 1c, and the rear combustion grate 1c is rearward in the space immediately above it. Create a combustion zone. Thereafter, the ash remaining after the combustion is discharged to the outside from the ash drop opening 4. Thus, the waste is combusted by the primary air blown from below the three-stage grate 1a to 1c.

  In such an incinerator, the combustion of waste is performed in the main combustion chamber 1, and unburned gas contained in the combustion exhaust gas receives secondary air from the secondary air inlet 5 and receives secondary air. Secondary combustion is performed in the combustion chamber 2 to completely burn the unburned portion. The exhaust gas from the secondary combustion chamber 2 is heat-exchanged in the waste heat boiler 10 and then discharged from the chimney in a detoxified state via a temperature reducing tower, a bag filter (both not shown), etc. Is done. In a waste heat boiler, heat is recovered from a high-temperature combustion exhaust gas by a heat exchanger to generate steam, and the steam is used for heat supply, power generation, and the like.

  The incinerator of FIG. 2 includes two systems of combustion air supply systems, primary air and secondary air. The primary air supply system is connected from the fan 6 to the grate 1a to 1c via a flow rate adjusting mechanism 7 such as a damper. The secondary air supply system is a system that blows secondary air from the blower port 5 into the main combustion chamber 1 through a flow rate adjusting mechanism 9 such as a damper.

JP-A-9-49624

  In the conventional waste incinerator as shown in FIG. 2, the ratio (air ratio) obtained by dividing the amount of air actually supplied into the furnace by the theoretical amount of air necessary for combustion of waste is usually 1.6. Degree. This is larger than 1.05 to 1.2 which is an air ratio necessary for combustion of general fuel. The reason for this is that waste has a higher incombustibility than liquid fuel and gaseous fuel as general fuel, and the distribution of fuel is inhomogeneous. This is because a large amount of air is required. However, if the supply air is simply increased, the amount of exhaust gas increases as the air ratio increases, and accordingly, a larger exhaust gas treatment facility is required.

  If waste can be burned without problems in an incinerator with a reduced air ratio, the amount of exhaust gas will be reduced, and the exhaust gas treatment facility will become compact. As a result, the entire waste incineration facility will be downsized and equipment costs will be reduced. it can. In addition, since the amount of chemicals for exhaust gas treatment is also reduced, the operating cost can be reduced. Furthermore, since the amount of heat that cannot be recovered and discarded to the atmosphere can be reduced and the heat recovery rate of the waste heat boiler can be improved, the efficiency of waste power generation can be increased.

  Under such circumstances, it has been studied to operate a waste incinerator with a low air ratio of 1.3 or less. Since the amount of exhaust gas discharged from the incinerator is reduced by operating at a low air ratio, the sensible heat per volume of the exhaust gas increases, the heat recovery efficiency in the waste heat boiler is improved, and the power generation efficiency by the generated steam is increased. The exhaust gas treatment facility can be made compact, and the entire waste incineration facility can be made compact.

  As described above, however, the advantage over the low air ratio combustion becomes large, but the problem remains that the combustion becomes unstable in the low air ratio combustion. That is, if waste is burned at a low air ratio, the combustion becomes unstable, the generation of CO increases, the flame temperature rises locally, NOx increases rapidly, soot is generated in large quantities, There are problems that clinker is generated and that the lifetime of the refractory in the furnace is shortened due to local high temperatures.

  In the grate-type incinerator, even if the amount of air supplied to the incinerator is reduced and the low air ratio combustion is directed, the primary air supplied from the grate for drying, combustion, and post-combustion is about 1.2 If it is not supplied, the state of combustion of the waste will deteriorate, burning out will worsen, leading to an increase in unburned ash (increased heat loss). Therefore, in order to operate at low air ratio combustion, attempts have been made to reduce the amount of secondary air, but there are the following problems. That is, secondary air is blown in the furnace width direction (horizontal direction) from a plurality of nozzles provided on the incinerator side wall above the waste layer on the grate. As a result, when the amount of secondary air is reduced with a low air ratio combustion operation, the secondary air supplied from the nozzle cannot reach the center of the furnace, and the secondary air is generated in the furnace at the center of the furnace. In this case, the unburned gas may not be completely burned and CO gas on the order of several hundred ppm may remain in the combustion exhaust gas. It also causes the occurrence of. When the CO spike is generated, exhaust gas containing harmful substances is discharged outside the furnace, which is not preferable for preventing pollution. Therefore, it is difficult to realize low air ratio combustion.

  In view of such circumstances, the present invention is a grate-type waste incinerator and waste that can suppress the generation of harmful gases such as CO even when low air ratio combustion is performed and can stably burn waste. It is an object to provide an incineration method.

  According to the present invention, the above problem is solved by a waste incinerator or a waste incineration method configured as follows.

<Waste incinerator>
A waste incinerator according to the present invention has a main combustion chamber for burning waste input from a waste input port, and a secondary combustion chamber for burning unburned gas after combustion in the main combustion chamber It is connected to the outlet side of the main combustion chamber. A dry grate, a combustion grate, and a post-combustion grate are provided in this order at the bottom of the main combustion chamber. Primary air supply means for supplying primary air is provided.

  In such a waste incinerator, in the present invention, high temperature air supply means for supplying high temperature air of 100 to 200 ° C. from below the post combustion grate is provided, and the high temperature air passes through the main combustion chamber and the secondary combustion chamber. It is characterized by being supplied to.

  In the present invention, the high-temperature air supply means supplies the amount of high-temperature air sufficient to burn the unburned portion of the waste on the post-combustion grate and to burn the unburned gas in the secondary combustion chamber. It is preferable to have the capability.

<Waste incineration method>
The waste incineration method according to the present invention has a main combustion chamber for burning waste input from a waste inlet, and the secondary combustion chamber for burning unburned gas after combustion in the main combustion chamber includes the main combustion chamber. In a waste incinerator that is connected to the outlet side of the main combustion chamber and is provided with a dry grate, a combustion grate, and a post-combustion grate in the lower part of the main combustion chamber, Primary air is supplied from below each of the above.

  In such a waste incineration method, the present invention is characterized in that high-temperature air of 100 to 200 ° C. is supplied from below the post-combustion grate, and the high-temperature air is supplied to the secondary combustion chamber through the main combustion chamber. .

  In the present invention, the high-temperature air may be supplied with a sufficient amount of high-temperature air to burn unburned waste on the post-combustion grate and to burn unburned gas in the secondary combustion chamber. preferable.

  In such a waste incinerator and waste incineration method of the present invention, in addition to supplying primary air from below the dry grate and the combustion grate, high-temperature air at 100 to 200 ° C. Is supplied from below the post-combustion grate, the combustion reactivity on the post-combustion grate is significantly improved. Therefore, the high-temperature air efficiently burns the unburned waste of the post-combustion grate, and the high-temperature air is supplied to the secondary combustion chamber through the main combustion chamber, and unburned gas is removed in the secondary combustion chamber. Can burn completely. Therefore, even in low air ratio combustion, waste and unburned gas can be stably burned, generation of harmful substances such as CO can be suppressed, and low air ratio combustion can be achieved.

  This high-temperature air passes through the vent holes of the post-combustion grate formed in the entire furnace width direction of the post-combustion grate and is uniformly distributed in the furnace width direction (horizontal direction), and then the post-combustion grate After rising through the main combustion chamber above, the secondary combustion chamber is reached. As a result, even under the low air ratio combustion, the high-temperature air reaches the secondary combustion chamber sufficiently uniformly even in the center portion in the furnace width direction, and the unburned gas is burned well.

  In addition, the high-temperature air efficiently burns the unburned waste of the post-burning grate, so it is necessary for the post-burning of the unburned content on the post-burning grate compared to supplying normal temperature air. Time can be shortened, and the area of the post-combustion grate can be reduced.

  In addition, since secondary air for secondary combustion of unburned gas in the secondary combustion chamber can be covered only with high-temperature air supplied from below the post-combustion grate, conventionally, the space above the post-combustion grate A separate mechanism for supplying the secondary combustion air that has been directly supplied can be omitted.

  As described above, since the present invention supplies high-temperature air of 100 to 200 ° C. from below the post-combustion grate, the unburned matter of the waste of the post-combustion grate is efficiently burned, Hot air is supplied to the secondary combustion chamber through the main combustion chamber, and the unburned gas can be completely burned in the secondary combustion chamber. Therefore, a waste incinerator and a waste incineration method that can stably burn waste and unburned gas even with low air ratio combustion, can suppress the generation of harmful substances such as CO, and can achieve low air ratio combustion. Can be provided.

It is a schematic block diagram of a waste incinerator apparatus as 1st embodiment of this invention. It is a schematic block diagram of the conventional waste incinerator apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to FIG. 1 of the accompanying drawings.

<First embodiment>
In the waste incinerator of this embodiment shown in FIG. 1, a secondary combustion chamber 12 is continuously provided on the outlet side of the main combustion chamber 11 for burning waste. The secondary combustion chamber 12 is also a part of the waste heat boiler 17 for waste heat recovery and is in the vicinity of the inlet.

  In the lower part of the main combustion chamber 11, a dry grate 11a, a combustion grate 11b, and a post-combustion grate 11c are provided in this order from the upstream side in the waste movement direction (right direction in the figure). Each grate 11a, 11b, 11c is accompanied by an operation of moving waste on the grate to the right.

  In the incinerator, a waste charging port 13 is provided above the upstream side of the dry grate 11 a, and communicates with the upper space of the main combustion chamber 11 by a chute 14 hanging from the waste charging port 13. In addition, the waste introduced from the waste inlet 13 is supplied to the dry grate 11a through the chute 14 by a waste supply mechanism (not shown). The waste supplied on the dry grate 11a moves to the combustion grate 11b and the post-combustion grate 11c while forming a waste layer on the grate by the operation of each grate 11a to 11c. . Below each grate 11a-11c, wind boxes 11a-1, 11b-1, and 11c-1 for receiving supply of combustion air are provided. The primary air for combustion is used for drying and burning waste on the grate, and also has a grate cooling action and a waste agitation action. Further, an ash drop opening 15 that opens downward is provided at a position adjacent to the rear combustion grate 11c on the downstream side.

  A secondary combustion chamber 12 is connected to the main combustion chamber 11 at a position above the outlet (downstream side) of the main combustion chamber 11. The waste heat boiler 17 has a secondary combustion chamber 12 in the vicinity of the inlet, a bent flow passage space is formed following the secondary combustion chamber 12, and the waste heat is recovered by a water cooling wall or a heat transfer tube group on the inner wall surface. Exhaust gas is discharged from the upper discharge port 17a for the next process.

  In the present embodiment, the incinerator is provided with three air supply systems of primary air that is combustion air, high-temperature air, and, as a preferable mode, secondary air. The primary air supply system 21 feeds air from an air supply source from the branch supply pipes 21a and 21b to the wind boxes 11a-1 and 11b-1 of the dry grate 11a and the combustion grate 11b via the pipe line 22, respectively. The pipe 22 is provided with a pressure feeding fan 23 and a damper 24 as a flow rate adjusting mechanism. The high-temperature air supply system 25 is configured to send air from the air supply source to the wind box 11c-1 of the post-combustion grate 11c after preheating with an air preheater 27 provided in the pipe line 26. The duct 26 is provided with a pressure feeding fan 28 and a damper 29 as a flow rate adjusting mechanism. Further, the secondary air supply system 31 is configured to send air from an air supply source to the secondary combustion chamber 12 through a pipe line 32. The pipe 32 has a pressure feed fan 33 and a supply amount. A damper 34 as an adjustment mechanism is provided. The configuration of the wind box and the pipelines for supplying the primary air, high temperature air and secondary air for combustion is not limited to those shown in the figure, and may be appropriately selected according to the scale, shape, application, etc. of the incinerator. obtain. The exhaust port 17a of the waste heat boiler 17 is provided with an oxygen concentration meter 35 for detecting the oxygen concentration of the exhaust gas discharged from the discharge port 17a, and the oxygen concentration meter 35 is connected to a control device 36 provided outside the furnace. The control device 36 controls the opening degree of the damper 34 in accordance with the detected oxygen concentration.

  The air supply sources of the primary air supply system 21, the high-temperature air supply system 25, and the secondary air supply system 31 may be common or individually provided.

  The temperature of the high-temperature air supplied from under the post-combustion grate 11c is in the range of 100 to 200 ° C. The reason for this is that if the temperature of the hot air to be blown is less than 100 ° C., the temperature of the secondary combustion chamber decreases, the secondary combustion of the unburned gas becomes unstable, the CO increases, and the temperature of the hot air If the temperature exceeds 200 ° C., there is no economic effect commensurate with higher temperatures. As the heat source of the air preheater 27, steam generated by a waste heat boiler can be used.

  In the present embodiment, since high-temperature air is blown from the bottom of the post-combustion grate 11c, the unburned portion of the waste on the post-combustion grate 11c is heated by the high-temperature air, combustion is promoted, and combustion is completely completed. To do. Since the unburned portion of the waste on the post-combustion grate 11c is efficiently burned by the high-temperature air, compared with the case where normal temperature air is supplied, the post-burning of the unburned portion on the post-combustion grate 11c is performed. The required time can be shortened, and the length of the post-combustion grate 11c can be reduced.

  In this embodiment, as a preferred embodiment, the secondary air supply system 31 further includes a damper 34 as a secondary air supply amount adjustment mechanism. In this case, the waste including the secondary combustion chamber 12 is included. The oxygen concentration of the exhaust gas from the heat boiler 17 is detected by the oxygen concentration meter 35, and the amount of secondary air supplied is increased or decreased by controlling the damper 34 so that the concentration falls within a predetermined range. When the secondary air for secondary combustion of the unburned gas in the secondary combustion chamber 12 can be sufficiently covered only by the high-temperature air supplied from below the post-combustion grate 11c, the secondary air supply system 31 Can be omitted.

  In such an incinerator of this embodiment, a waste layer is formed on each grate 11a-11c.

  A dry region is formed in the upstream range in the waste flow direction on the dry grate 11a immediately above the dry grate 11a, and a combustion start region is formed in the downstream range. That is, the waste in the dry grate 11a is dried in the upstream range, ignited in the downstream range, starts combustion, and moves to the combustion grate 11b. The waste on the combustion grate 11b is pyrolyzed and partially oxidized here, and combustible gas and solid content are combusted. The waste is substantially burned on the combustion grate 11b. Thus, a main combustion region is formed immediately above the combustion grate 11b. Thereafter, the unburned matter such as fixed carbon in the remaining waste moves to the post-combustion grate and is completely burned on the post-combustion grate 11c. Thereafter, a post-combustion region is formed on the post-combustion grate 11c.

  Unburned gas generated in the main combustion chamber 11 flows into the secondary combustion chamber 12 located above the post-combustion grate 11c and burns there, and the secondary combustion region is located above the post-combustion region. Form.

  Such an incinerator of this embodiment is operated in the following manner.

  First, when waste is introduced into the waste inlet 13, the waste is deposited on the dry grate 11a via the chute 14, and the operation of each grate 11a to 11c causes the grate on the combustion grate 11b and the post-combustion grate. 11c to form a waste layer on each grate 11a-11c.

  Each grate 11a-11c receives primary air for combustion via wind boxes 11a-1, 11b-1 and high temperature air via wind box 11c-1, and thereby each grate 11a-11c. The waste above will burn.

  In the dry grate 11a, waste is mainly dried and ignited. That is, drying is performed in the upstream region of the dry grate 11a in the waste flow direction, and ignition (combustion start) is performed in the downstream region. In the combustion grate 11b, thermal decomposition and partial oxidation of waste are mainly performed, and combustible gas and solid content are combusted. The combustion of the waste is substantially completed in the combustion grate 11b. On the post-combustion grate 11c, unburned components such as fixed carbon in the remaining waste are completely put and burned. The combustion ash after complete combustion is discharged from the ash drop opening 15. With the waste burning in this manner, the above-described drying region, combustion start region, main combustion region, and post-combustion region are formed in the space immediately above each grate 11a to 11c.

  In the present embodiment, the hot air preheated by the air preheater 27 is supplied to the post-combustion grate 11c by the pressure feeding fan 28 via the wind box 11c-1. The high-temperature air sent into the wind box 11c-1 passes through the vent hole formed in the entire furnace width direction of the post-combustion grate 11c, and the furnace width direction (perpendicular to the paper surface in FIG. 1). In a uniformly distributed state, it passes through the post-combustion region in the main combustion chamber 11 and reaches the secondary combustion chamber 12 thereabove, where secondary combustion is performed together with the secondary air supplied by the secondary air supply system 31. Contribute to.

  In the present embodiment, since the high-temperature air is fed from below the post-combustion grate 11c, the high-temperature air travels uniformly in the furnace width direction, and as a result, the amount of air is low even in low air ratio combustion. There is no sufficient area, and secondary combustion can be performed by supplying a minimum amount of air according to the amount of unburned gas in the secondary combustion chamber 12.

  The supply amount of the secondary air is adjusted by increasing / decreasing the opening degree of the damper 34 by the control device 36. This is the detection of the exhaust gas at the discharge port 17a of the waste heat boiler 17 detected by the oximeter 35. The oxygen concentration is performed so as to be within a predetermined range. The oxygen concentration of the exhaust gas correlates with the CO concentration, and the lower limit of the predetermined range of the oxygen concentration is determined as an oxygen concentration that does not cause a CO spike, and the upper limit is determined as a value that makes the air ratio as low as possible. A predetermined range is determined.

  As described above, the secondary combustion chamber 12 which is a part of the waste heat boiler 17 is connected to the outlet of the main combustion chamber 11 on the side opposite to the waste input port 13. Therefore, the unburned gas generated in the main combustion chamber 11 is guided to the secondary combustion chamber 12 where it is mixed and stirred with the above-described high-temperature air and secondary air, followed by secondary combustion, and from the secondary combustion chamber 12. The combustion exhaust gas is recovered by the waste heat boiler 17. After heat recovery, the combustion exhaust gas discharged from the waste heat boiler 17 is subjected to neutralization of acid gas by slaked lime and adsorption of dioxins by activated carbon, and is further sent to a dust removal device (not shown), where activated carbon And neutralized reactants are recovered. The combustion exhaust gas that has been dedusted and detoxified by the dust removing device is attracted by an attracting fan (not shown) and released from the chimney into the atmosphere. In addition, as said 1st and 2nd dust removal apparatus, dust removal apparatuses, such as a bag filter system and an electrostatic dust collection system, can be used, for example.

  Next, in the present embodiment, control of the secondary air amount based on the atmosphere of the secondary combustion chamber and the exhaust gas oxygen concentration will be described in detail.

<Atmosphere of secondary combustion chamber>
It is preferable to adjust the flow rate of the secondary air so that the gas temperature in the secondary combustion chamber is in the range of 800 to 1050 ° C. The reason is that if the gas temperature in the secondary combustion chamber becomes less than 800 ° C., combustion becomes insufficient and CO increases, and if the gas temperature in the secondary combustion chamber exceeds 1050 ° C., the secondary combustion chamber becomes secondary. This is because generation of clinker in the combustion chamber is promoted, and NOx is further increased.

<Control of secondary air volume based on exhaust gas oxygen concentration>
In the present embodiment, the oxygen concentration of the exhaust gas at the exhaust port 17a of the waste heat boiler 17 is measured, and the secondary air supply amount is controlled based on this measurement. The oxygen concentration, the CO concentration in the exhaust gas, and the exhaust gas Table 1 shows the relationship between the NOx concentration and the secondary air supply amount.

  When combustible gas generated by waste and thermal decomposition in an incinerator is combusted within the range of appropriate oxygen concentration and temperature, the most harmful substances such as CO, NOx, DXN (dioxins) are generated. It is suppressed. In Table 1, when the oxygen concentration in the exhaust gas near the boiler outlet is high, the CO concentration discharged from the incinerator decreases or remains unchanged, but the NOx concentration increases. Therefore, the secondary air supply amount is decreased and the oxygen supply amount to the secondary combustion chamber is decreased so that the combustion in the secondary combustion chamber is appropriately performed. On the contrary, when the oxygen concentration in the exhaust gas near the boiler outlet is low, the NOx concentration discharged from the incinerator decreases or remains unchanged, but the CO concentration increases. Therefore, the secondary air supply amount is increased, the oxygen supply amount to the secondary combustion chamber is increased, and combustion in the secondary combustion chamber is appropriately performed.

  As described above, according to the present invention, even when low air ratio combustion is performed in a waste incinerator, the stability of combustion is maintained, the occurrence of local high temperature regions is suppressed, and CO, NOx, etc. Provided are a waste incinerator and a waste incineration method capable of reducing the generation amount of harmful gas. Furthermore, since a low air ratio combustion can be performed, the total amount of exhaust gas discharged from the incinerator can be significantly reduced, and a waste incinerator and a waste incineration method that can improve waste heat recovery efficiency are provided.

DESCRIPTION OF SYMBOLS 11 Main combustion chamber 11a Dry grate 11b Combustion grate 11c Post combustion grate 12 Secondary combustion chamber 13 Waste inlet 21 Primary air supply means

Claims (4)

A main combustion chamber for combusting waste input from the waste input port, and a secondary combustion chamber for combusting unburned gas after combustion in the main combustion chamber is connected to the outlet side of the main combustion chamber; In the lower part of the main combustion chamber, a dry grate, a combustion grate, and a post-combustion grate are provided in this order, and primary air supply means for supplying primary air from below each of the dry grate and the combustion grate In the grate-type waste incinerator provided,
A high-temperature air supply means for supplying high-temperature air of 100 to 200 ° C. from below the post-combustion grate is provided, and the high-temperature air is supplied to the secondary combustion chamber through the main combustion chamber. Characteristic waste incinerator.   The hot air supply means has a supply capability of supplying a sufficient amount of hot air to burn the unburned waste of the waste on the post-combustion grate and to burn the unburned gas in the secondary combustion chamber. The waste incinerator according to claim 1. A main combustion chamber for combusting waste input from the waste input port, and a secondary combustion chamber for combusting unburned gas after combustion in the main combustion chamber is connected to the outlet side of the main combustion chamber; In a waste incinerator where a dry grate, a combustion grate, and a post-combustion grate are provided in the lower part of the main combustion chamber, primary air is supplied from below the dry grate and the combustion grate. In the waste incineration method,
A waste incineration method, characterized in that high-temperature air of 100 to 200 ° C is supplied from below the post-combustion grate, and the high-temperature air is supplied to the secondary combustion chamber through the main combustion chamber.   The hot air is supplied with a quantity of hot air sufficient to burn the unburned waste of the waste on the post-combustion grate and to burn the unburned gas in the secondary combustion chamber. The waste incinerator described in 1.

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