JP4551860B2 - Waste treatment system and waste treatment method - Google Patents

Description

  The present invention relates to a waste treatment system and a waste treatment method for gasifying and treating waste, and in particular, disposal capable of preventing corrosion of the gas reforming furnace and suppressing the manufacturing cost of the gas reforming furnace. The present invention relates to a material processing system and a waste processing method.

  In general, in order to turn waste into resources, a method has been developed in which waste is gasified, and this gas is chemically changed to convert or reform it into an industrially useful gas.

Such a waste treatment system that recycles waste includes a pyrolysis furnace that pyrolyzes an object to be processed to generate pyrolysis gas, and a reformed gas by reforming the pyrolysis gas from the pyrolysis furnace. A gas reforming furnace for generating a gas, a gas cooling section for cooling the reformed gas from the gas reforming furnace, and a gas cleaning section for cleaning the cooled reformed gas from the gas cooling section to generate a generated gas Have. Among these, the pyrolysis gas generated in the pyrolysis furnace is heated at 1300 ° C. or more in the gas reforming furnace, chemically changed to a useful gas such as H ₂ , and recovered (see, for example, Patent Document 1). .

  The gas reforming furnace is composed of a combustion apparatus that performs combustion using pyrolysis gas generated in the pyrolysis furnace as fuel. For this reason, when preheating the gas reforming furnace to a predetermined temperature (temperature raising step), it is reasonable to use a burner made of city gas or liquid fuel. At this time, from the viewpoint of economy, in order to maximize the fuel usage efficiency by completely burning the fuel, when burning by the burner, the air is in a slightly excessive condition so that the ratio of air to fuel is about 1.1. Combustion takes place.

  In addition, when the waste treatment is completed and the gas reforming furnace is cooled (temperature lowering step), in order to prevent the heat insulating wall of the gas reforming furnace from being damaged by rapid cooling, a cooling rate control operation by a burner, so-called It is necessary to carry out a grate. Even during the temperature lowering, the air is performed under a slightly excessive condition so that the ratio of air to the fuel becomes about 1.1 as in the case of the temperature rising.

  Furthermore, if the gas reforming furnace is cooled when the process of reforming the pyrolysis gas is interrupted, the time required for the next temperature increase is unreasonable. For this reason, a standby heat-retaining step for keeping the temperature of the gas reforming furnace with a burner constant is necessary. Also in this standby heat insulation process, the air is performed under a slightly excessive condition so that the ratio of the air to the fuel is about 1.1, as in the case of the temperature increase or the temperature decrease.

  On the other hand, when reforming pyrolysis gas and producing | generating reformed gas (processing process), it is necessary to heat pyrolysis gas at about 1000-1300 degreeC. At this time, if the gas reforming furnace is heated under the condition of complete combustion, the temperature of the gas reforming furnace becomes excessively high because the gas reforming furnace has a high degree of heat insulation. It will exceed a certain 2000 ° C. For this reason, in a process process, it is necessary to heat with a burner under air shortage combustion conditions or air excess conditions.

Here, in the gas reforming furnace, it is necessary to chemically change and recover the pyrolysis gas generated in the pyrolysis furnace into a reformed gas containing a combustible gas having a reducing property such as H _2. Such a condition is not preferable. For this reason, the combustion conditions for reforming the pyrolysis gas in the gas reforming furnace are performed under the air-deficient combustion conditions in which the air ratio is 0.3 to 0.4.
Japanese Patent Laid-Open No. 10-236801

  In the conventional waste treatment system as described above, a temperature raising step for raising the temperature of the gas reforming furnace, a standby heat retention step for keeping the temperature of the gas reforming furnace constant, and a temperature lowering for lowering the temperature of the gas reforming furnace. In the process, air with an air ratio of about 1.1 by the burner has slightly excessive combustion conditions, whereas in the process of reforming the pyrolysis gas to generate the reformed gas, the pyrolysis gas is used as fuel. It becomes a combustion condition with insufficient air with an air ratio of 0.3 to 0.4.

Such a difference in combustion conditions greatly affects the environment in the gas reforming furnace. For example, paying attention to the equilibrium oxygen partial pressure in the gas reforming furnace, as shown in FIG. 8, in the temperature raising process, the standby temperature keeping process, and the temperature lowering process, which are combustion conditions with an air ratio of 1.1, For this reason, the equilibrium oxygen partial pressure in the gas reforming furnace shows a high value of about 0.01 to 0.1 MPa, whereas in the treatment step where the combustion ratio is an air ratio of 0.3 to 0.4, Since it is an air-deficient combustion condition, the equilibrium oxygen partial pressure is as low as 10 ⁻¹⁹ to 10 ⁻²² MPa.

  Thus, since the equilibrium oxygen partial pressure in the gas reforming furnace changes extremely in the temperature raising process, the standby temperature maintaining process, the temperature lowering process, and the processing process, the material constituting the gas reforming furnace is the equilibrium oxygen. It must be able to withstand both the high and low partial pressure conditions. For this reason, the material which comprises a gas reforming furnace must use a high performance material, and the manufacturing cost of a gas reforming furnace will become high.

  The present invention has been made in consideration of the above points, and is a waste treatment system capable of preventing the gas reforming furnace from being corroded and manufacturing the gas reforming furnace at a low cost. And to provide a waste disposal method.

The present invention includes a pyrolysis furnace that pyrolyzes an object to be processed to generate pyrolysis gas, and a gas reformer that is supplied with oxygen and reforms the pyrolysis gas from the pyrolysis furnace to generate a reformed gas. A gas reforming furnace comprising: a furnace; a gas cooling unit for cooling the reformed gas from the gas reforming furnace; and a gas cleaning unit for cleaning the cooled reformed gas from the gas cooling unit to generate a generated gas. The waste oxygen treatment system is characterized in that the equilibrium partial pressure of oxygen in the inside is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa.

  The present invention includes a pyrolysis furnace that pyrolyzes an object to be processed to generate pyrolysis gas, and a gas reformer that is supplied with oxygen and reforms the pyrolysis gas from the pyrolysis furnace to generate a reformed gas. And a gas cooling section for cooling the reformed gas from the gas reforming furnace, and a gas cleaning section for cleaning the cooled reformed gas from the gas cooling section. A waste treatment system comprising a heating device for heating a quality furnace.

  The present invention is the waste treatment system, wherein the heating device has a burner that can be driven even if the air ratio to the supplied fuel is less than 1.

The present invention includes a pyrolysis process for pyrolyzing a workpiece to generate pyrolysis gas in a pyrolysis furnace, and reforming the pyrolysis gas while supplying oxygen to the gas reforming furnace. A reforming process for generating a quality gas, a cooling process for cooling the reformed gas in the gas cooling section, and a cleaning process for cleaning the reformed gas in the gas cleaning section. The waste oxygen treatment method is characterized in that the equilibrium oxygen partial pressure is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa.

  The present invention includes a pyrolysis process for pyrolyzing a workpiece to generate pyrolysis gas in a pyrolysis furnace, and reforming the pyrolysis gas while supplying oxygen to the gas reforming furnace. A gas reforming process comprising: a reforming process for generating a quality gas; a cooling process for cooling the reformed gas in the gas cooling section; and a cleaning process for cleaning the reformed gas to generate a generated gas in the gas cleaning section. The furnace has a heating device, and the gas reforming furnace is heated by the heating device.

  In the present invention, the reforming step includes a temperature raising step for raising the temperature of the gas reforming furnace, a standby temperature keeping step for keeping the temperature of the gas reforming furnace constant, a temperature lowering step for lowering the temperature of the gas reforming furnace, A treatment process for reforming the cracked gas to generate a reformed gas, and the gas reforming furnace is heated by a heating device in the temperature raising process, the standby temperature maintaining process, and the temperature lowering process. This is a material processing method.

  The present invention provides a gas reforming furnace having a main body made of a metal oxide having a high equilibrium dissociation oxygen partial pressure and a film made of a metal oxide having a low equilibrium dissociation partial pressure formed on the inner surface of the main body. In the process, the equilibrium oxygen partial pressure of oxygen in the gas reforming furnace is made smaller than the equilibrium dissociation oxygen partial pressure of the gas reforming furnace body and larger than the equilibrium dissociation oxygen partial pressure of the gas reforming furnace film. A waste treatment method characterized by the above.

  According to the present invention, the heating apparatus for a gas reforming furnace has a burner that can be driven even if the air ratio to the supplied fuel is less than 1, and the air ratio to the fuel supplied to the burner is set to less than 1 in the reforming process. Thus, the equilibrium oxygen partial pressure of oxygen contained in the gas reforming furnace is made smaller than the equilibrium dissociation oxygen partial pressure of the gas reforming furnace main body, and more than the equilibrium dissociation oxygen partial pressure of the gas reforming furnace film. This is a waste disposal method characterized in that it is enlarged.

  The present invention is the waste treatment method, wherein the metal oxide constituting the main body of the gas reforming furnace is an oxide of iron, nickel, or cobalt.

  The present invention is the waste treatment method, wherein the metal oxide constituting the coating film of the gas reforming furnace is an oxide of chromium, aluminum, or silicon.

  According to the present invention, by maintaining the equilibrium partial pressure of oxygen in the gas reforming furnace at a low value, it is possible to prevent the gas reforming furnace from being corroded and It can be manufactured at low cost.

First Embodiment Hereinafter, a first embodiment of a waste treatment system according to the present invention will be described with reference to the drawings. Here, FIG. 1 (a) (b) and FIG. 2 are figures which show the 1st Embodiment of this invention.

  As shown in FIG. 1 (a), the waste treatment system of the present embodiment is supplied with a pyrolysis furnace 1 that pyrolyzes an object 51 to produce a pyrolysis gas 21, oxygen 24, and heat. A gas reforming furnace 2 for reforming the pyrolysis gas 21 from the cracking furnace 1 to generate a reformed gas 22, a gas cooling section 3 for cooling the reformed gas 22 from the gas reforming furnace 2, and a gas cooling A gas cleaning unit 4 that cleans the cooled reformed gas 23 from the unit 3 to generate a generated gas 25.

  Next, the operation of the present embodiment having such a configuration will be described.

  First, as shown in FIGS. 1A and 1B, the workpiece 51 is decomposed in the pyrolysis furnace 1 to generate pyrolysis gas 21 (thermal decomposition step 31). Next, oxygen 24 is supplied into the gas reforming furnace 2, and the pyrolysis gas 21 is reformed in the gas reforming furnace 2 to generate the reformed gas 22 (reforming step 32). Thereafter, the reformed gas 22 is cooled in the gas cooling unit 3 (cooling step 33), and then the cooled reformed gas 23 is cleaned in the gas cleaning unit 4 to generate a product gas 25. (Washing step 34).

  Among these, as shown in FIG. 2, the reforming step 32 includes a temperature raising step 41 for raising the temperature of the gas reforming furnace 2, a standby temperature keeping step 42 for keeping the temperature of the gas reforming furnace 2 constant, and a gas reforming. It comprises a temperature lowering step 43 for lowering the temperature of the furnace 2 and a processing step 44 for reforming the pyrolysis gas 21 to generate the reformed gas 22. Here, FIG. 2 shows the time dependency of the operation process in the gas reforming furnace 2, the temperature in the gas reforming furnace 2, and the equilibrium oxygen partial pressure in the gas reforming furnace 2.

As shown in FIG. 2, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is as follows: a temperature raising step 41 in a reforming step 32, a standby temperature keeping step 42, a temperature lowering step 43 and Regardless of the process step 44, the low value burned under the air-deficient combustion condition with an air ratio of about 0.3 to 0.4, that is, 10 ⁻¹⁹ to 10 ⁻²² MPa is maintained. ing.

  For this reason, it is possible to prevent the gas reforming furnace 2 from being corroded by the excess oxygen 24 in the gas reforming furnace 2.

  Moreover, since the inside of the gas reforming furnace 2 can be prevented from being corroded in this way, it is not necessary to use an expensive corrosion-resistant alloy or the like as a constituent material of the gas reforming furnace 2. For this reason, the gas reforming furnace 2 can also be manufactured at low cost.

Second Embodiment Next, a second embodiment of the present invention will be described with reference to FIG. In the second embodiment shown in FIG. 3, the gas reforming furnace 2 is provided with a heating device 11 for heating the gas reforming furnace 2, and the others are shown in FIGS. This is substantially the same as the first embodiment shown in FIG.

  In the second embodiment shown in FIG. 3, the same parts as those in the first embodiment shown in FIGS. 1A and 1B and FIG.

As shown in FIG. 3, a heating device 11 is provided in the gas reforming furnace 2, and the gas reforming furnace 2 is heated using the heating device 11 provided in the gas reforming furnace 2. For this reason, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air with an air ratio of about 0.3 to 0.4, That is, even if it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, the temperature raising step 41 for raising the temperature of the gas reforming furnace 2, the standby temperature keeping step 42 for keeping the temperature of the gas reforming furnace 2 constant, In each step of the temperature lowering step 43 for lowering the temperature of the quality furnace 2, the gas reforming furnace 2 can be kept at a high temperature.

  That is, since the temperature of the gas reforming furnace 2 itself can be maintained at a high temperature in the temperature raising step 41 and the standby temperature keeping step 42, the reforming of the pyrolysis gas 21 in the gas reforming furnace 2 can be performed efficiently. . Also in the temperature lowering step 43, the temperature of the gas reforming furnace 2 itself can be gradually lowered from a high temperature, so that the gas reforming furnace 2 can be reliably prevented from being damaged by being rapidly cooled.

Further, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air conditions with an air ratio of about 0.3 to 0.4, that is, Since it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, it is possible to prevent the gas reforming furnace 2 from being corroded by the excess oxygen 24 in the gas reforming furnace 2.

  Furthermore, since the inside of the gas reforming furnace 2 can be prevented from being corroded in this way, it is not necessary to use an expensive corrosion resistant alloy or the like as a constituent material of the gas reforming furnace 2. For this reason, the gas reforming furnace 2 can also be manufactured at low cost.

Third Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. The third embodiment shown in FIG. 3 uses a burner 12 that can be driven even when the air ratio of the combustion air 28 to the supplied fuel 29 is less than 1, as the heating device, and the others are shown in FIG. This is substantially the same as the second embodiment.

  In the third embodiment shown in FIG. 4, the same parts as those of the second embodiment shown in FIG.

As shown in FIG. 4, a burner 12 is provided in the gas reforming furnace 2, and the gas reforming furnace 2 is heated using the burner 12 provided in the gas reforming furnace 2. For this reason, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air with an air ratio of about 0.3 to 0.4, That is, even if it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, the temperature raising step 41 for raising the temperature of the gas reforming furnace 2, the standby temperature keeping step 42 for keeping the temperature of the gas reforming furnace 2 constant, In each step of the temperature lowering step 43 for lowering the temperature of the quality furnace 2, the gas reforming furnace 2 can be kept at a high temperature.

  That is, since the temperature of the gas reforming furnace 2 itself can be maintained at a high temperature in the temperature raising step 41 and the standby temperature keeping step 42, the reforming of the pyrolysis gas 21 in the gas reforming furnace 2 can be performed efficiently. . Also in the temperature lowering step 43, the temperature of the gas reforming furnace 2 itself can be gradually lowered from a high temperature, so that the gas reforming furnace 2 can be prevented from being damaged by being rapidly cooled.

Further, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air conditions with an air ratio of about 0.3 to 0.4, that is, Since it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, it is possible to prevent the gas reforming furnace 2 from being corroded by the excess oxygen 24 in the gas reforming furnace 2.

  Furthermore, since the inside of the gas reforming furnace 2 can be prevented from being corroded in this way, it is not necessary to use an expensive corrosion resistant alloy or the like as a constituent material of the gas reforming furnace 2. For this reason, the gas reforming furnace 2 can also be manufactured at low cost.

  Note that the burner 12 used in the present embodiment can be driven even when the air ratio of the combustion air 28 to the supplied fuel 29 is less than 1, so that the combustion condition in which the air is insufficient in the gas reforming furnace 2 is reliably realized. can do.

Fourth Embodiment Next, a fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment shown in FIG. 5, the components of the gas reforming furnace temperature measuring unit 61 that measures the temperature in the gas reforming furnace 2 and the product gas 25 obtained by cleaning the reformed gas 23 are obtained. A generated gas analysis unit 62 for analysis, a combustion air flow rate adjustment unit 63 for adjusting the flow rate of the combustion air 28 flowing into the burner 12, a fuel flow rate adjustment unit 64 for adjusting the flow rate of the fuel 29 flowing into the burner 12, and a generation A gas branch flow rate adjusting unit 66 and a control unit 65 for controlling each of these parts are further provided, and the others are substantially the same as those in the third embodiment shown in FIG.

  As shown in FIG. 5, the gas cleaning unit 4 and the gas reforming furnace 2 are connected by a connecting pipe 67, and the generated gas 25 generated by cleaning the reformed gas 23 in the gas cleaning unit 4. A part of the gas flows into the gas reforming furnace 2 through the connecting pipe 67.

  In the fourth embodiment shown in FIG. 5, the same parts as those of the third embodiment shown in FIG.

  In FIG. 5, the temperature in the gas reforming furnace 2 is measured by the gas reforming furnace temperature measuring unit 61, and the oxygen partial pressure in the product gas 25 is measured by the product gas analyzing unit 62.

  Next, the temperature data in the gas reforming furnace 2 measured by the gas reforming furnace temperature measuring unit 61 is input from the gas reforming furnace temperature measuring unit 61 to the control unit 65, and the generated gas analyzing unit 62 is used. The oxygen partial pressure data in the product gas 25 measured by the above is input from the product gas analyzer 62 to the controller 65.

  Next, in the control unit 65, the combustion air flow rate and the fuel flow rate flowing into the burner 12, the gas, The flow rate of the branched product gas flowing into the reforming furnace 2 is required.

  Next, the combustion air flow rate adjustment unit 63 and the fuel flow rate adjustment unit 64 are driven and controlled in accordance with the combustion air flow rate and fuel flow rate obtained by the control unit 65, and a predetermined amount of combustion air 28 and fuel 29 flow into the burner 12. The gas reforming furnace 2 is heated by the burner 12. Also. According to the branch product gas flow calculated by the control unit 65, the branch flow rate adjusting unit 66 of the connection pipe 67 is driven and controlled, and the branch product gas 25 flows into the gas reforming furnace 2.

  As described above, according to the present embodiment, the control unit 65 causes the gas reforming furnace temperature measuring unit 61, the generated gas analyzing unit 62, the combustion air flow rate adjusting unit 63, the fuel flow rate adjusting unit 64, and the generated gas branch flow rate adjusting unit. The gas reforming furnace 2 can be heated in an optimal state by driving and controlling each of 66.

As shown in FIG. 5, a burner 12 is provided in the gas reforming furnace 2, and the gas reforming furnace 2 is heated using the burner 12 provided in the gas reforming furnace 2. For this reason, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air with an air ratio of about 0.3 to 0.4, That is, even if it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, the temperature raising step 41 for raising the temperature of the gas reforming furnace 2, the standby temperature keeping step 42 for keeping the temperature of the gas reforming furnace 2 constant, In each step of the temperature lowering step 43 for lowering the temperature of the quality furnace 2, the gas reforming furnace 2 can be kept at a high temperature.

  That is, since the temperature of the gas reforming furnace 2 itself can be maintained at a high temperature in the temperature raising step 41 and the standby temperature keeping step 42, the reforming of the pyrolysis gas 21 in the gas reforming furnace 2 can be performed efficiently. . Also in the temperature lowering step 43, the temperature of the gas reforming furnace 2 itself can be gradually lowered from a high temperature, so that the gas reforming furnace 2 can be prevented from being damaged by being rapidly cooled.

Further, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and the oxygen 24 in the gas reforming furnace 2 is a low value combusted under a shortage of air conditions with an air ratio of about 0.3 to 0.4, that is, Since it is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa, it is possible to prevent the gas reforming furnace 2 from being corroded by the excess oxygen 24 in the gas reforming furnace 2.

  Furthermore, since the inside of the gas reforming furnace 2 can be prevented from being corroded in this way, it is not necessary to use an expensive corrosion resistant alloy or the like as a constituent material of the gas reforming furnace 2. For this reason, the gas reforming furnace 2 can also be manufactured at low cost.

  Note that the burner 12 used in the present embodiment can be driven even when the air ratio of the combustion air 28 to the supplied fuel 29 is less than 1, so that the combustion condition in which the air is insufficient in the gas reforming furnace 2 is reliably realized. be able to.

Fifth Embodiment Next, a third embodiment of the present invention will be described with reference to FIG. In the fifth embodiment shown in FIG. 6, the gas reforming furnace 2 comprises a main body 2a made of a metal oxide having a high equilibrium dissociation oxygen partial pressure and a metal oxide having a low equilibrium dissociation partial pressure. A gas reforming furnace 2 composed of a film 2b formed on the inner surface of the furnace 2 is used, and the others are substantially the same as those of the third embodiment shown in FIG. Here, FIG. 6 shows a schematic cross-sectional view of the gas reforming furnace 2.

  In the fifth embodiment shown in FIG. 6, the same parts as those of the third embodiment shown in FIG.

  In the present embodiment, the equilibrium oxygen partial pressure of the oxygen 24 with respect to the pyrolysis gas 21 and oxygen 24 in the gas reforming furnace 2 is made smaller than the equilibrium dissociated oxygen partial pressure of the gas reforming furnace body 2a, and the gas reforming is performed. By making it larger than the equilibrium dissociated oxygen partial pressure of the blast furnace film 2b, it is possible to prevent the gas reforming furnace body 2a from being oxidized and deteriorated. On the other hand, the gas reforming furnace film 2b is oxidized. Therefore, a stronger oxide film can be generated.

  That is, not only the gas reforming furnace main body 2a is prevented from being deteriorated, but also the gas reforming furnace coating 2b can be strengthened, so that the gas reforming furnace 2 is reliably prevented from being corroded. Can do.

  The metal of the metal oxide used in the gas reforming furnace main body 2a is empirically based on the fourth period of the periodic table, the fourth period of the periodic table, due to the yield, strength, workability, diversity as a solvent when alloying, and the like. Group 10 to 10 are used, that is, iron, cobalt, and nickel. On the other hand, the gas reforming furnace coating 2b is provided to protect the metal oxide of the gas reforming furnace main body 2a from corrosion, and the metal oxide metal used for such a gas reforming furnace coating 2b. As an example, chromium, aluminum, and silicon are empirically used because of their affinity for oxygen 24, the mobility of ions of the metal oxide film to be formed, the self-diffusion coefficient in the alloy, and the adhesion to the alloy.

  The equilibrium dissociated oxygen partial pressure of the metal oxide composed of these metals can be obtained by specifying the temperature from the temperature function of the change in free energy of formation of each metal oxide. As an example, the equilibrium dissociated oxygen partial pressure of each metal oxide at 800 ° C. is shown in FIG.

As shown in FIG. 7, when the reformed gas 22 is generated by reforming the pyrolysis gas 21 in the gas reforming furnace 2 at 800 ° C., for example, the metal oxide used in the gas reforming furnace body 2a Is lower than the equilibrium dissociation oxygen partial pressure (1.91 × 10 ^-18 (0.1 MPa)) of the iron oxide having the lowest equilibrium dissociation oxygen partial pressure, and is the most equilibrium among the metal oxides used in the gas reforming furnace film 2b. Equilibrium oxygen of oxygen 24 against pyrolysis gas 21 and oxygen 24 in gas reforming furnace 2 so as to be higher than the equilibrium dissociation oxygen partial pressure (2.20 × 10 ⁻²⁸ (0.1 MPa)) of chromium having a high dissociated oxygen partial pressure. The partial pressure is adjusted.

1 is a block diagram showing a first embodiment of a waste treatment system according to the present invention. The schematic which showed the temperature in a gas reforming furnace and the equilibrium oxygen partial pressure, and each process of a reforming process in the waste disposal system by this invention. The block diagram which showed 2nd Embodiment of the waste disposal system by this invention. The block diagram which showed 3rd Embodiment of the waste disposal system by this invention. The block diagram which showed 4th Embodiment of the waste disposal system by this invention. The schematic sectional drawing of the gas reforming furnace in 5th Embodiment of the waste disposal system by this invention. The chart which shows the equilibrium dissociation oxygen partial pressure of the oxide of each element in 800 degreeC. Schematic which showed the temperature and equilibrium oxygen partial pressure in the gas reforming furnace in the conventional waste disposal system, and each process of a reforming process.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Thermal decomposition furnace 2 Gas reforming furnace 3 Gas cooling part 4 Gas cleaning part 11 Heating device 12 Burner 21 Thermal decomposition gas 22, 23 Reformed gas 24 Oxygen 29 Fuel 31 Thermal decomposition process 32 Reforming process 33 Cooling process 34 Cleaning process 41 Temperature rising process 42 Standby heat retention process 43 Temperature decreasing process 44 Processing process

Claims (6)

A pyrolysis furnace that pyrolyzes the workpiece to generate pyrolysis gas;
A gas reforming furnace that is supplied with oxygen and reforms the pyrolysis gas from the pyrolysis furnace to generate a reformed gas;
The equilibrium oxygen partial pressure of oxygen in the gas reforming furnace is maintained at 10 ⁻¹⁹ to 10 ⁻²² MPa ,
The gas reforming furnace is formed on a main body made of a metal oxide having an equilibrium dissociated oxygen partial pressure higher than an equilibrium oxygen partial pressure of oxygen in the gas reforming furnace, and an inner surface of the main body. A waste treatment system comprising: a metal oxide film having a lower equilibrium dissociation oxygen partial pressure than the equilibrium oxygen partial pressure.   2. The waste treatment system according to claim 1, wherein the gas reforming furnace is provided with a heating device for heating the gas reforming furnace.   The waste treatment system according to claim 2, wherein the heating device has a burner that can be driven even if the air ratio to the supplied fuel is less than one. Waste treatment system according to claim 1, wherein the metal oxide constituting the main body of the gas reforming furnace, iron, an oxide of nickel or cobalt. Metal oxide constituting the film of the gas reforming furnace, the waste processing system of claim 1, wherein the chromium, an oxide of aluminum or silicon. In a pyrolysis furnace, a pyrolysis process for pyrolyzing a workpiece to generate pyrolysis gas,
A reforming step of reforming the pyrolysis gas to generate a reformed gas while supplying oxygen into the gas reforming furnace,
The reforming step maintains the equilibrium oxygen partial pressure of oxygen in the gas reforming furnace at 10 ⁻¹⁹ to 10 ⁻²² MPa ,
The gas reforming furnace has a heating device,
The reforming process includes a temperature raising process for raising the temperature of the gas reforming furnace, a standby temperature maintaining process for keeping the temperature of the gas reforming furnace constant, a temperature lowering process for lowering the temperature of the gas reforming furnace, and reforming the pyrolysis gas. And a reforming process to produce a reformed gas,
A waste treatment method, wherein the gas reforming furnace is heated by a heating device in the temperature raising step, the standby temperature keeping step, and the temperature lowering step.

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