JP2005061817A - Waste dry distillation gasification incineration treatment method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a waste dry distillation gasification incineration treatment method capable of preventing discharge of carbon monoxide in the final stage of dry distillation of waste. <P>SOLUTION: The waste A stored in a gasification furnace 1 is distilled by oxygen supplied from an oxygen supply source 16, and generating combustible gas is introduced to and burnt in a combustion furnace 2. In the dry distillation, oxygen of a quantity for generating the combustible gas required for maintaining the combustion temperature of the combustible gas in the combustion furnace 2 substantially constant at the preset prescribed combustion temperature, is supplied to a gasification furnace 2 from the oxygen supply source 16. When the dry distillation reaches the final stage, combustion of the combustible gas is assisted by an auxiliary combustion means 14 equipped in the combustion furnace 2. In the final stage of the carbonization, when a detecting value of the carbon monoxide concentration in exhaust gas of the combustion furnace 2 is higher than a prescribed value, an oxygen quantity supplied in the gasification furnace 2 from the oxygen supply source 16 is reduced, and a quantity of combustible gas generated in the gasification furnace 2, is controlled so that the carbon monoxide becomes a combustible quantity by the auxiliary combustion means 14. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

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

  As a method for incinerating waste such as waste tires, for example, while burning a part of the waste stored in the gasification furnace, the remainder of the waste is dry-distilled (pyrolysis) by the combustion heat, A method is known in which combustible gas generated by dry distillation is introduced from a gasification furnace into a combustion furnace and burned. In the method, conventionally, the combustion temperature of the combustible gas in the combustion furnace is detected, and the oxygen supply amount to the gasification furnace is adjusted so that the combustible gas is combusted at a preset combustion temperature. It is known that feedback control of dry distillation gasification in the gasification furnace is performed (see, for example, Patent Document 1).

  When performing dry distillation gasification incineration treatment of waste as described above, first, oxygen is supplied from the oxygen supply source into the gasification furnace, and a part of the waste contained in the gasification furnace is removed. Combustible gas is generated by burning and carbonizing the remainder of the waste by the combustion heat. And the combustible gas produced | generated in the said gasification furnace is introduce | transduced into the said combustion furnace, and is burned completely.

  At this time, the gasification furnace has an amount of oxygen that generates a combustible gas necessary for maintaining the combustion temperature of the combustible gas in the combustion furnace at a predetermined combustion temperature that is set in advance. Supplied from the oxygen source. The supply of oxygen from the oxygen supply source to the gasification furnace is to reduce the supply amount of oxygen if the combustion temperature of the combustible gas in the combustion furnace tends to increase, and to reduce oxygen if the combustion temperature tends to decrease This is done in such a way as to increase the supply amount.

  In this way, as the carbonization of the waste in the gasification furnace proceeds, the waste that is carbonized eventually decreases, and the final stage of the carbonization of the waste is reached. At the end of the dry distillation, even if the amount of oxygen supplied from the oxygen supply source to the gasification furnace is made close to the maximum, the combustion temperature of the combustible gas in the combustion furnace is only maintained at a predetermined combustion temperature. It becomes impossible to produce the combustible gas. Therefore, at the end stage of the carbonization of the waste, combustion of the combustible gas is assisted by a burner provided in the combustion furnace.

  By the way, depending on the material of the waste, there is one that generates carbon monoxide at the end of the dry distillation. When the amount of carbon monoxide generated is large, even if combustion is assisted by the burner in the combustion furnace, the carbon monoxide is not sufficiently combusted and discharged into the atmosphere together with the combustion exhaust from the combustion furnace. May be.

  Therefore, in order to burn the carbon monoxide, it is conceivable to increase the heating power of the burner. However, since fuel is required to burn the burner, an increase in cost is inevitable if the heating power of the burner is increased.

Carbon monoxide can be prevented from being generated by supplying sufficient oxygen to the generation source. However, at the end stage of the carbonization, the amount of oxygen supplied from the oxygen supply source to the gasifier that is the source of carbon monoxide is close to the maximum, and oxygen to the gasifier is There is an inconvenience that it is difficult to further increase the supply amount.
JP-A-2-135280

  The present invention eliminates such inconvenience, and prevents carbon monoxide from being discharged at a low cost at the end of the dry distillation when the waste is dry distilled and the combustible gas generated by the dry distillation is incinerated. An object of the present invention is to provide a carbonization incineration treatment method for waste.

  In order to achieve such an object, the method of dry distillation gasification incineration according to the present invention is a method for combustible gas obtained by dry distillation of waste contained in a gasification furnace using oxygen supplied from an oxygen supply source. Generating a combustible gas in the gasification furnace, introducing the combustible gas generated in the gasification furnace into the combustion furnace and burning the combustible gas, and during the dry distillation of the waste in the gasification furnace, Supplying oxygen from the oxygen supply source into the gasification furnace in an amount that generates the combustible gas necessary for maintaining the combustion temperature at a predetermined predetermined combustion temperature substantially constant; A carbonization incineration treatment of waste comprising a step of assisting combustion of the combustible gas by auxiliary combustion means provided in the combustion furnace when the carbonization of the waste in the gasification furnace reaches an end stage In the method, the waste in the gasifier When the carbon monoxide concentration in the exhaust gas of the combustion furnace is detected at the end of the carbonization of the product, and the detected value of the carbon monoxide concentration is higher than a predetermined value, the gasification furnace is supplied from the oxygen supply source. The amount of combustible gas generated in the gasification furnace is reduced by the amount of oxygen supplied into the gasification furnace, and the carbon monoxide contained in the combustible gas can be combusted by auxiliary combustion means provided in the combustion furnace. It is characterized by controlling so that it may become a quantity.

  In the method of the present invention, first, the waste housed in the gasification furnace is dry-distilled using oxygen supplied from the oxygen supply source to the gasification furnace, and combustible gas is generated by the dry distillation. The carbonization of the waste is performed by carbonizing the remainder of the waste with the heat of combustion while burning a part of the waste.

  The combustible gas produced | generated in the said gasification furnace is introduce | transduced into a combustion furnace, and is burned with the oxygen supplied to this combustion furnace from the said oxygen supply source. The combustible gas starts to combust when ignited in the combustion furnace, but as the combustible gas generated in the gasification furnace increases, the combustible gas spontaneously combusts by its own heat quantity. Become.

  When the combustible gas spontaneously burns, the carbonization of the waste in the gasification furnace is performed at a predetermined combustion temperature in which the combustion temperature of the combustible gas in the combustion furnace is set in advance. It is carried out so as to generate a combustible gas necessary for maintaining it substantially constant. At this time, the generation of the combustible gas is controlled by the amount of oxygen supplied from the oxygen supply source to the gasifier, and the amount of oxygen supplied if the combustion temperature of the combustible gas in the combustion furnace tends to increase. If the combustion temperature tends to decrease, the oxygen supply amount is increased.

  In this manner, when the carbonization of the waste in the gasifier proceeds, the waste to be carbonized eventually decreases, and the final stage of the carbonization is reached. At the end of the dry distillation, the combustion temperature of the combustible gas in the combustion furnace is maintained at a predetermined combustion temperature even when the amount of oxygen supplied from the oxygen supply source to the gasifier is increased to a maximum. It becomes impossible to produce only combustible gas. Therefore, in the combustion furnace, combustion of the combustible gas is assisted by the auxiliary combustion means.

  Depending on the waste material, a large amount of carbon monoxide may be generated in the gasifier at the end of the carbonization. At this time, if the carbon monoxide is not sufficiently burned by the auxiliary combustion means, a high concentration of carbon monoxide is discharged into the atmosphere.

  In order to prevent the high-concentration carbon monoxide from being discharged into the atmosphere, it is conceivable to increase the heating power of the auxiliary combustion means, but when doing so, an increase in cost is inevitable. In addition, it is conceivable to supply sufficient oxygen to the gasification furnace, which is the source of carbon monoxide, to prevent the generation of carbon monoxide itself, but at the end of the dry distillation, from the oxygen source The supply amount of oxygen to the gasifier is close to the maximum, and it is difficult to increase the supply amount of oxygen further.

  Therefore, in the method of the present invention, the carbon monoxide concentration in the exhaust gas of the combustion furnace is detected at the end of the dry distillation, and when the detected value of the carbon monoxide concentration is higher than a predetermined value, the oxygen supply The amount of oxygen supplied from the source into the gasifier is reduced. If it does in this way, since the production | generation itself of the combustible gas in the said gasification furnace is suppressed, the amount of carbon monoxide contained in this combustible gas is also reduced in connection with this. As a result, the amount of carbon monoxide is controlled so as to be combustible by auxiliary combustion means provided in the combustion furnace.

  Therefore, even if carbon monoxide is generated in the gasification furnace, the carbon monoxide can be reliably burned in the combustion furnace, and can be prevented from being discharged into the atmosphere at a low cost. .

  When the dry distillation is completed, the waste in the gasification furnace is incinerated and discharged outside the furnace, and then new waste is accommodated in the furnace and the next incineration process is performed. By the way, as described above, when the generation of the combustible gas is suppressed at the end of the dry distillation, it takes a long time until the waste is incinerated after the dry distillation. Efficiency is reduced.

  Therefore, in the method of the present invention, the carbon monoxide concentration in the exhaust gas of the combustion furnace is detected every predetermined time at the end of the dry distillation of the waste in the gasifier, and the detected value of the carbon monoxide concentration is detected. Is higher than the previous detection value, the amount of oxygen supplied from the oxygen supply source into the gasifier is reduced more than before, and when the detected value of the carbon monoxide concentration is lower than the previous detection value, The amount of oxygen supplied from the oxygen supply source into the gasification furnace is increased more than before.

  In the method of the present invention, the amount of oxygen supplied from the oxygen supply source to the gasification furnace is reduced at the end of dry distillation of the waste in the gasification furnace, and then the exhaust gas in the combustion furnace is exhausted. When the detected value of the carbon monoxide concentration becomes lower than a predetermined value, the amount of oxygen supplied from the oxygen supply source into the gasifier is increased, and the waste after the dry distillation is ashed. It is characterized by that.

  When doing so, the amount of oxygen supplied from the oxygen supply source into the gasifier can be adjusted according to the amount of carbon monoxide produced in the gasifier, and the waste ash The time required for conversion can be shortened.

  Next, embodiments of the present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is a system configuration diagram of a dry distillation gasification incineration processing apparatus used in the present embodiment. FIG. 2 is a graph showing combustion temperature of a combustible gas in a combustion furnace, carbon monoxide concentration, and oxygen supply amount to the gasification furnace. It is a graph which shows a relationship.

  The dry distillation gasification incineration apparatus shown in FIG. 1 stores waste A such as waste tires, the gasification furnace 1 in which the dry distillation / gasification and combustion / ashing are performed, and the waste gas A in the gasification furnace 1 Combustion furnace 2 that combusts combustible gas generated by dry distillation, temperature sensor 3 that detects the combustion temperature T of the combustible gas in the combustion furnace 2, oxygen supply means 4 that supplies oxygen (air) to the gasification furnace 1, and combustion furnace 2 is provided with oxygen supply means 5 for supplying oxygen (air) to 2 and discharge means 6 for discharging the combustion exhaust of the combustion furnace 2.

  A gas inlet 8 having a door 7 that can be freely opened and closed is formed on the upper surface of the gasifier 1 so that the waste A can be charged into the gasifier 1 from the inlet 8. The gasification furnace 1 is substantially cut off from the outside air when the charging door 7 is closed. A lower portion of the gasification furnace 1 is a vacant chamber, and an oxygen supply means 4 is connected to the vacant chamber. Then, oxygen supplied from the oxygen supply means 4 to the vacant chamber is supplied into the gasification furnace 1 through a plurality of supply nozzles 9.

  An ignition device 10 composed of an ignition burner or the like is attached to the lower side portion of the gasification furnace 1. The ignition device 10 burns fuel such as auxiliary combustion oil supplied from a fuel supply device (not shown) to generate a combustion flame toward the inside of the gasification furnace 1, and this combustion flame causes the inside of the gasification furnace 1. Waste A is ignited. Further, a water jacket 11 isolated from the inside of the gasification furnace 1 is formed on the outer periphery of the gasification furnace 1 as a cooling structure thereof, and the water jacket 11 is provided outside the gasification furnace 1 and is not shown. Water is supplied from the water supply device.

  In the combustion furnace 2, a gas passage 13 led out from a connection part 12 provided at the upper part of the gasification furnace 1 is connected to a base part (burner part), and combustible generated by dry distillation of waste A in the gasification furnace 1. Sex gas is introduced. An ignition device 14 is attached to the rear end portion of the combustion furnace 2 so as to ignite the combustible gas introduced from the gas passage 13. The ignition device 14 is composed of an ignition burner and the like, similar to the ignition device 10, and burns fuel such as auxiliary combustion oil supplied from a fuel supply device (not shown) to burn a combustion flame toward the inside of the combustion furnace 2. It is supposed to give birth.

  An outer peripheral portion of the combustion furnace 2 is a vacant chamber, and an oxygen supply means 5 is connected to the vacant chamber. Then, oxygen supplied from the oxygen supply means 5 to the vacant chamber is supplied into the combustion furnace 2 through a plurality of nozzle holes 15 provided in the outer peripheral wall of the combustion furnace 2.

  The oxygen supply means 4 for supplying oxygen to the gasification furnace 1 includes an oxygen supply source 16 such as a pushing fan provided outside the gasification furnace 1, and a main oxygen supply pipe 17 led out from the oxygen supply source 16. And a sub-oxygen supply pipe 18 branched from the main oxygen supply pipe 17 and connected to the lower part of the gasification furnace 1. The auxiliary oxygen supply pipe 18 is provided with an adjustment valve 19 whose opening degree is adjusted in accordance with a detection signal input from the temperature sensor 3.

  The oxygen supply means 5 for supplying oxygen to the combustion furnace 2 is branched from the oxygen supply source 16, a main oxygen supply pipe 17 led out from the oxygen supply source 16, and the main oxygen supply pipe 17. The auxiliary oxygen supply pipe 20 is connected to the outer peripheral portion of the combustion furnace 2. The sub oxygen supply pipe 20 is provided with an adjustment valve 21 whose opening degree is adjusted in accordance with a detection signal input from the temperature sensor 3.

  The discharge means 6 for discharging the combustion exhaust of the combustion furnace 2 includes a cooling furnace 22 for cooling the combustion exhaust, a desulfurization / deodorization device 23 for desulfurization and deodorization of the combustion exhaust by slaked lime, activated carbon, etc., a bag filter 24, A pushing fan 26 for pushing the combustion exhaust into the chimney 25 is provided. The chimney 25 is provided with a CO sensor 27 that detects carbon monoxide in the combustion exhaust gas, and a detection signal is sent to the regulating valve 19 of the gasifier 1.

  Next, the dry distillation gasification incineration processing method of this embodiment by the apparatus shown in FIG. 1 will be described.

  In the dry distillation gasification incineration processing method of the present embodiment, first, the charging door 7 of the gasification furnace 1 is opened, and the waste A is charged into the gasification furnace 1 from the charging port 8. Next, after closing the closing door 7, the ignition device 10 is operated for a predetermined time, whereby the waste A in the gasification furnace 1 is ignited and partial combustion of the waste A is started.

  At the start of the partial combustion of the waste A, the regulating valve 19 of the auxiliary oxygen supply pipe 18 connected to the gasification furnace 1 is opened with a slight opening, and the gasification furnace 1 is supplied from the oxygen supply source 16. A relatively small amount of oxygen (air) is supplied inside. For this reason, the partial combustion of the waste A is started using oxygen existing in the gasification furnace 1 and a relatively small amount of oxygen supplied from the oxygen supply source 16.

  Thus, when the partial combustion in the lower layer part of the waste A in the gasification furnace 1 is started, dry distillation of the upper layer part of the waste A is started by the combustion heat, and combustible gas is generated by the dry distillation. Begins. The combustible gas generated in the gasification furnace 1 is introduced into the base end portion (burner portion) of the combustion furnace 2 through the gas passage 13 and is ignited by the ignition device 14 of the combustion furnace 2 to start combustion. To do.

  At this time, in the gasification furnace 1, the opening degree of the regulating valve 19 of the sub-oxygen supply pipe 18 is set so that the oxygen supply amount to the gasification furnace 1 is necessary for continuous partial combustion in the lower layer portion of the waste A. While gradually limiting, it is gradually increased. In this way, the partial combustion of the waste A in the gasification furnace 1 is gradually stabilized while consuming a small amount of oxygen supplied from the oxygen supply source 16, while the combustion range is from the oxygen supply source 16. It gradually expands in the lower layer part of the waste A according to the amount of oxygen supplied. And with the stabilization of combustion in the lower layer part of the waste A, the dry distillation of the upper layer part of the waste A due to the combustion heat gradually becomes active and proceeds stably, and the combustibility generated by the dry distillation. The amount of gas will also increase gradually.

  As a result, as shown in the upper part of FIG. 2, the combustion temperature T of the combustible gas in the combustion furnace 2 detected by the temperature sensor 3 also increases. The ignition device 10 of the gasification furnace 1 is stopped when it is confirmed that the combustion in the lower layer portion of the waste A is stabilized.

Next, when the combustion temperature T of the combustible gas detected by the temperature sensor 3 further increases and reaches a temperature slightly lower than the combustion temperature T ₁ set in advance as a temperature at which the combustible gas can spontaneously burn, The regulating valve 19 is automatically feedback controlled so that the combustion temperature T is maintained substantially constant at the combustion temperature T ₁ .

Specifically, when the combustion temperature T of the combustible gas detected by the temperature sensor 3 becomes smaller than the combustion temperature T ₁ , the opening of the regulating valve 19 is increased to increase the amount of oxygen supplied to the gasifier 1. , To help generate flammable gas. Conversely, when the combustion temperature T of the combustible gas detected by the temperature sensor 3 becomes higher than the combustion temperature T ₁ , the opening of the regulating valve 19 is reduced to reduce the amount of oxygen supplied to the gasifier 1 and combustible. Suppresses the generation of sex gases. Thus, by feedback controlling the opening of the adjustment valve 19, as shown in the upper part of FIG. 2, the combustion temperature T of the combustible gas is maintained at a substantially constant combustion temperature T ₁ of the combustion furnace 2, gas Combustion of the lower layer portion of the waste A in the conversion furnace 1 and dry distillation of the upper layer portion proceed stably.

When the combustion temperature T of the combustible gas in the combustion furnace 2 is maintained at a substantially constant combustion temperature T ₁ , the ignition device 14 of the combustion furnace 2 is stopped, and the combustible gas is continuously spontaneously combusted. It becomes. When combusting the combustible gas in the combustion furnace 2, the adjustment valve 21 of the auxiliary oxygen supply pipe 20 connected to the combustion furnace 2 corresponds to the combustion temperature T of the combustible gas detected by the temperature sensor 3. The opening degree is automatically adjusted, and the amount of oxygen required for complete combustion of the combustible gas is supplied into the combustion furnace 2.

  Exhaust gas (exhaust gas) generated by the combustion of combustible gas in the combustion furnace 2 is cooled by the cooling tower 22, desulfurized and deodorized by slaked lime and activated carbon by the desulfurization / deodorization device 23, and then fine dust is produced by the bag filter 24. Is removed. And finally, it is introduce | transduced into the chimney 25 by the pushing fan 26, and is discharged | emitted from the chimney 25 in air | atmosphere.

  Depending on the material, the waste A generates carbon monoxide when carbonized in the gasification furnace 1, and the carbon monoxide is a part of the combustible gas generated in the gasification furnace 1. It is introduced into the combustion furnace 2. The combustible gas itself has a large amount of heat when the opening degree of the regulating valve 19 is feedback controlled, and the carbon monoxide is sufficiently burned in the combustion furnace 2. Therefore, the carbon monoxide concentration in the combustion exhaust gas detected by the CO sensor 27 provided in the chimney 25 is an amount that does not affect the environment even if it is discharged into the atmosphere.

However, when dry distillation in the gasification furnace 1 proceeds and reaches the final stage of dry distillation, the portion of the waste A that can generate combustible gas is reduced, and the opening of the regulating valve 19 is almost all. Even when the valve is fully opened, the combustion temperature T of the combustible gas generated in the gasifier ₁ cannot maintain the predetermined combustion temperature T ₁ . Then, even if the ignition device 14 is ignited again in the combustion furnace 2 to assist the combustion of the combustible gas, the carbon monoxide is not sufficiently burned, and the carbon monoxide concentration detected by the CO sensor 27 is high. It becomes. Therefore, in the method of the present embodiment, if the combustion temperature T of the combustible gas detected by the temperature sensor 3 falls to a predetermined temperature T ₂ , the dry distillation in the gasification furnace 1 has entered the end stage. Judgment and control of carbon monoxide concentration are started.

In the method of this embodiment, the combustion temperature T of the combustible gas detected by the temperature sensor 3 may once rise to a predetermined temperature T _{2 and} then rise again. In such a case, the dry distillation in the gasification furnace 1 has not yet entered the end stage, and the combustion temperature T of the combustible gas has only temporarily dropped to the temperature T _{2 for} some reason. Conceivable. Therefore, when the combustion temperature T of the combustible gas once falls to the predetermined temperature T _{2 and} then rises again, the control of the carbon monoxide concentration is stopped and the opening degree of the regulating valves 19 and 21 is automatically set again. Control to be adjusted to.

The control of the concentration of carbon monoxide, first, when the combustion temperature T of the combustible gas detected by the temperature sensor 3 drops to a predetermined temperature T _2, a predetermined carbon monoxide concentration detected by the CO sensor 27 To a reference value (for example, 50 ppm). Next, when the combustion temperature T of the combustible gas falls to a predetermined temperature T ₂ , the carbon monoxide concentration a detected by the CO sensor 27 is greater than a predetermined reference value as shown in the middle stage of FIG. If it is higher, as shown in the lower part of FIG.

  When the opening degree of the regulating valve 19 is reduced, the amount of oxygen supplied in the gasifier 1 is reduced, so that the amount of combustible gas produced itself is reduced, and the amount of carbon monoxide produced is also reduced accordingly. Therefore, the carbon monoxide can be sufficiently burned by the combustion flame of the ignition device 14 in the combustion furnace 2.

Therefore, in the method of this embodiment, after the combustion temperature T of the combustible gas drops to a predetermined temperature T _2, to detect the concentration of carbon monoxide by the CO sensor 27 every predetermined time. Here, when the detected values b, c, d, e of the carbon monoxide concentration are higher than the previous detected values a, b, c, d, an operation for reducing the opening degree of the previous adjusting valve 19. Therefore, it is determined that the carbon monoxide is not sufficient to be combusted in the combustion furnace 2, and the opening degree of the regulating valve 19 is successively reduced by a predetermined amount and supplied to the gasifier 1. Further reduce the amount of oxygen.

  On the other hand, when the carbon monoxide concentration detected by the CO sensor 27 is lower than the previous detection value b, for example, as the detection value c ′ shown in the middle stage of FIG. 2, the previous adjustment valve 19 is opened. It is determined that the carbon monoxide can be burned in the combustion furnace 2 by the operation of decreasing the degree. In this case, as indicated by a broken line in the lower part of FIG. 2, the opening degree of the adjustment valve 19 is increased by a predetermined amount from the previous time.

  As a result of the control of the carbon monoxide concentration, if the carbon monoxide concentration detected by the CO sensor 27 becomes lower than a predetermined reference value, for example, as a detection value f shown in the middle part of FIG. The opening degree of the regulating valve 19 is increased by a predetermined amount every predetermined time, and the waste A in the gasification furnace 1 is ashed. In this case as well, when the carbon monoxide concentration is detected by the CO sensor 27 every predetermined time and the detected value becomes higher than the previous detection, the opening degree of the adjusting valve 19 is set to a predetermined amount. Make it smaller.

  By doing so, it is possible to control the amount of carbon monoxide discharged into the atmosphere so as not to affect the environment. Further, in the control of the carbon monoxide concentration, when the carbon monoxide concentration detected by the CO sensor 27 is lower than the previous detection value or lower than a predetermined reference value, the regulating valve By making the opening degree of 19 larger than the previous time, the time required for ashing the waste A in the gasification furnace 1 can be shortened.

  Next, in the method of the present embodiment, when the ashing of the waste A is completed in the gasification furnace 1, the ashed waste A is discharged out of the furnace of the gasification furnace 1, and is supplied from the inlet 8. New waste A is introduced into the gasifier 1. And the following process is performed by repeating the above-mentioned procedure.

The system block diagram of the dry distillation gasification incineration processing apparatus used for the method of this invention. The graph which shows the relationship between the combustion temperature of the combustible gas in a combustion furnace, carbon monoxide density | concentration, and the oxygen supply amount with respect to a gasification furnace.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Gasification furnace, 2 ... Combustion furnace, 14 ... Auxiliary combustion means, 16 ... Oxygen supply source, 27 ... CO sensor, A ... Waste.

Claims (3)

A step of producing a combustible gas by dry distillation of waste contained in a gasification furnace using oxygen supplied from an oxygen supply source;
Introducing the combustible gas generated in the gasification furnace into the combustion furnace and burning it;
An amount for generating the combustible gas necessary for maintaining the combustion temperature of the combustible gas in the combustion furnace at a predetermined predetermined combustion temperature substantially constant during dry distillation of the waste in the gasification furnace Supplying oxygen from the oxygen supply source into the gasifier,
A process of assisting combustion of the combustible gas by auxiliary combustion means provided in the combustion furnace when dry distillation of the waste in the gasification furnace has reached an end stage; In the processing method,
When the carbon monoxide concentration in the exhaust gas of the combustion furnace is detected at the end of dry distillation of the waste in the gasification furnace, and the detected value of the carbon monoxide concentration is higher than a predetermined value, the oxygen The amount of oxygen supplied from the supply source into the gasification furnace is reduced, and the combustion furnace is provided with carbon monoxide contained in the combustible gas in an amount of the combustible gas generated in the gasification furnace. A waste carbonization incineration method for waste, which is controlled so as to be combustible by auxiliary combustion means.   When the carbon monoxide concentration in the exhaust gas of the combustion furnace is detected every predetermined time at the end of the carbonization of the waste in the gasification furnace, and the detected value of the carbon monoxide concentration is higher than the previous detection value The amount of oxygen supplied from the oxygen supply source into the gasification furnace is reduced more than before, and when the detection value of the carbon monoxide concentration is lower than the previous detection value, the oxygenation source supplies the gasification furnace. The method of claim 1, wherein the amount of oxygen supplied to the inside is increased more than before.   After reducing the amount of oxygen supplied from the oxygen supply source to the gasification furnace at the end of dry distillation of the waste in the gasification furnace, the detected value of the carbon monoxide concentration in the exhaust gas of the combustion furnace is 2. The waste after the dry distillation is incinerated by increasing the amount of oxygen supplied from the oxygen supply source into the gasification furnace when lower than a predetermined value. Or the carbonization incineration processing method of the waste of Claim 2 characterized by the above-mentioned.

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