JP5798728B2 - Dry distillation gasification incineration processing equipment - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a dry distillation gasification furnace that stores waste and also combusts a part of the waste to dry the remainder of the waste by combustion heat to generate a combustible gas.

  In recent years, wastes contain many chlorine components such as vinyl chloride. Therefore, incinerators that incinerate these wastes produce nitrogen oxides (NOx) and carbon monoxide during incineration. Air pollutants such as (CO) and dioxins can be generated. For this reason, certain environmental standards have been formulated to reduce emissions for these air pollutants.

  In particular, dioxins generated by incineration of waste are incomplete such as the chlorine liberated from the waste and incomplete resin when the waste containing chlorine is burned at a temperature of about 250 to 350 ° C. The hydrocarbons produced by combustion react with heavy metals contained in the waste as catalysts to produce dioxins.

  In order to prevent discharge of dioxins due to incineration of the waste, it is effective to cause the waste to stay at a temperature of 800 ° C. or higher for 2 seconds or more to completely thermally decompose the generated dioxins. It is said that.

  By the way, the present applicant, as an apparatus for incinerating waste such as waste tires while preventing the discharge of dioxins, stores the waste and burns a part of the waste, Proposed a dry distillation gasification incineration apparatus comprising a distillation furnace in which the remainder of the waste is dry-distilled by combustion heat to generate a combustible gas, and a combustion furnace in which the combustible gas is introduced from the dry distillation furnace and completely combusted (For example, refer to Patent Document 1).

  In the above apparatus, the temperature in the combustion furnace was heated to 800 ° C. or higher where dioxins can be thermally decomposed by combustion of other fuel, and then the waste was ignited to generate combustible gas. A combustible gas is burned together with other fuels in a combustion furnace. When the combustion furnace temperature can be maintained at a stable temperature higher than 800 ° C. by burning only the combustible gas, the combustion of the other fuel is terminated. As a result, after the start of the dry distillation of the waste, the temperature in the combustion furnace is set to 800 ° C. or more to discharge dioxins until the combustible gas spontaneously stabilizes and continues to burn in the combustion furnace. It is preventing.

Japanese Patent No. 4005770

  However, in the above apparatus, it is necessary to burn other fuel in the combustion furnace until the combustible gas spontaneously stabilizes and continues to burn in the combustion furnace. This may cause a disadvantage that the fuel required for this increases and the running cost of the apparatus increases.

  In particular, since the temperature of the air supplied to the combustion furnace for burning the combustible gas introduced into the combustion furnace is lower than the temperature of the combustion furnace maintained by warm air (800 ° C. or higher), The temperature is lowered, which is a factor that takes time and fuel required for auxiliary combustion.

  Here, by replacing oxygen necessary for combustion of the combustible gas with air and introducing it into the combustion furnace with high-concentration oxygen containing oxygen at a higher concentration than air, (by about 80% of nitrogen components in the air) It is conceivable to reduce the time and fuel required for auxiliary combustion (suppressing the absorption of heat), but simply replacing air with high-concentration oxygen will reduce the volume to 1/5 that of air. Does not mix well with the combustible gas, and a stable combustion state in the combustion furnace cannot be realized.

  Accordingly, the present invention provides a dry distillation gasification incineration processing apparatus that can stably burn combustible gas in a combustion furnace and save time and fuel required for auxiliary combustion in order to eliminate such inconvenience. The purpose is to do.

A dry distillation gasification incineration apparatus according to a first aspect of the present invention is a dry distillation furnace for storing a waste and generating a combustible gas by combusting a part of the waste and drying the remainder of the waste by the combustion heat. A combustion furnace for burning the combustible gas introduced from the dry distillation furnace, combustion oxygen supply means for supplying the combustion furnace with oxygen required for combustion of the combustible gas introduced into the combustion furnace, and the inside of the combustion furnace A combustion furnace temperature detecting means for detecting the temperature in the combustion furnace, and a temperature within the combustion furnace detected by the combustion furnace temperature detecting means after the combustion of the combustible gas in the combustion furnace is started. A dry distillation gasification incineration processing apparatus comprising a dry distillation oxygen supply means for supplying oxygen necessary for combustion of a part of the waste to the dry distillation furnace while adjusting an oxygen supply amount to the dry distillation furnace so as to maintain Because
The combustion oxygen supply means includes a first oxygen supply means for supplying high-concentration oxygen having an oxygen concentration of 90% or more, a second oxygen supply means for supplying air, and oxygen supply to the combustion furnace. Supply control means for switching between one oxygen supply means and the second oxygen supply means,
Until the supply control means reaches a predetermined temperature higher than the set temperature set as a temperature higher than the temperature at which the combustion of dioxins can be thermally decomposed by combustion of only combustible gas , Combustible gas is burned with high-concentration oxygen from the first oxygen supply means to raise the temperature of the combustion furnace, and when the predetermined temperature is reached as a trigger, supply of oxygen to the combustion furnace is performed. Switching from the first oxygen supply means to the second oxygen supply means,
The predetermined temperature is the temperature of the combustion furnace becomes the predetermined temperature, and the supply control means switches the supply of oxygen to the combustion furnace from the first oxygen supply means to the second oxygen supply means. Is set a predetermined amount higher than the set temperature so that the temperature drop of the combustion furnace due to
In the combustion furnace, a combustible gas introduced from the dry distillation furnace is introduced, a high concentration oxygen is supplied from the first oxygen supply means, and the second oxygen is communicated with the mixing part. Having a burner section to which air is supplied by the supply means, and a combustion section communicating with the burner section;
The mixing unit has a high concentration supplied by the combustible gas and the first oxygen supply means when the supply control means switches the supply of oxygen to the combustion furnace to the first oxygen supply means. Mixing with oxygen to produce a first gas mixture,
The burner unit combusts the first mixed gas generated by the mixing unit when the supply control unit switches the supply of oxygen to the combustion furnace to the first oxygen supply unit, and When supply of oxygen to the combustion furnace is switched to the second oxygen supply means by the supply control means, the combustible gas and the air supplied by the second oxygen supply means are mixed to perform second mixing. Generating gas, burning the generated second mixed gas,
In the combustion part, the first mixed gas or the second mixed gas that has started combustion in the burner part is introduced, and the combustion is continued,
The supply port of the first mixed gas of the mixing unit to the burner unit has a supply flow rate of the first mixed gas to the burner unit larger than a flow rate at which flashback occurs, and the first mixing in the burner unit It is formed so that it may become the flow velocity of the predetermined range smaller than the flow velocity which inhibits combustion of gas.

  According to the dry distillation gasification incineration processing apparatus of the first invention, the supply control means can switch the supply of oxygen to the combustion furnace to the high concentration oxygen by the first oxygen supply means or the air by the second oxygen supply means. . Therefore, the combustible gas is burned by the high-concentration oxygen supplied by the first oxygen supply means until the temperature of the combustion furnace reaches a predetermined temperature higher than the temperature at which dioxins can be thermally decomposed by burning only the combustible gas. Thus, absorption of heat by nitrogen components in the air can be suppressed, and time and fuel required for auxiliary combustion can be saved.

  At this time, the high-concentration oxygen supplied by the first oxygen supply means is mixed with the combustible gas by a dedicated mixing section provided upstream from the burner section. Therefore, high-concentration oxygen having a small volume can be sufficiently mixed with the combustible gas, and the combustible gas can be stably burned in the combustion furnace.

  In addition, after combustion of the combustible gas only and the temperature of the combustion furnace reaches a predetermined temperature higher than the temperature at which dioxins can be thermally decomposed, the supply of oxygen to the combustion furnace is switched to the second oxygen supply means, Air and combustible gas can be mixed in the burner (without consuming high-concentration oxygen), and combustible gas can be burned in the combustion furnace. Thereby, it can suppress that the temperature in a combustion furnace becomes high temperature by continuing supplying high concentration oxygen to a combustion furnace by a 1st oxygen supply means.

  Thus, according to the dry distillation gasification incineration processing apparatus of the first invention, the combustible gas can be stably burned in the combustion furnace, and the time and fuel required for auxiliary combustion can be saved.

The dry distillation gasification incineration apparatus of the second invention is the first invention,
The mixing unit includes a cylindrical mixer main body, a gas introduction pipe for introducing the combustible gas coaxially with a central axis of the mixer main body from one end of the mixer main body, and the first oxygen supply unit. An oxygen inlet for introducing the high-concentration oxygen into the mixer body so that the supplied high-concentration oxygen forms a vortex-like oxygen flow rotating about the axis of the gas introduction pipe; and the other end of the mixer body And a gas supply port for supplying the first mixed gas to the burner section.

  According to the dry distillation gasification incineration apparatus of the second invention, the high-concentration oxygen supplied by the first oxygen supply means is 1/5 smaller in volume than air, but is swirled around the axis of the gas introduction pipe. By introducing into the mixer main body so as to form an oxygen flow, it can be sufficiently mixed with the combustible gas introduced into the mixer main body from the gas introduction pipe.

  Thus, according to the dry distillation gasification incineration processing apparatus of the second invention, the high concentration oxygen supplied by the first oxygen supply means and the combustible gas can be mixed, and this can be stably performed in the combustion furnace. Can be burned.

The system block diagram which shows one Embodiment of the dry distillation gasification incineration processing apparatus of this invention. The graph which shows a time-dependent change with the valve opening degree and the temperature in a combustion furnace.

  As shown in FIG. 1, the waste dry gasification incineration apparatus of this embodiment is a dry distillation furnace that contains waste A, which is a mixture of various wastes, mainly waste paper, waste wood, waste plastic and the like. 1 and a combustion furnace 3 connected to the dry distillation furnace 1 through a gas passage 2. On the upper surface of the dry distillation furnace 1, an input port 5 having an openable / closable input door 4 is formed, and the waste A can be input into the dry distillation furnace 1 from the input port 5. In the state where the charging door 4 is closed, the inside of the dry distillation furnace 1 is substantially cut off from the outside.

  A water jacket 6 isolated from the inside of the dry distillation furnace 1 is formed on the outer peripheral portion of the dry distillation furnace 1 as a cooling structure. The water jacket 6 is supplied with water by a water supply device (not shown) so that the amount of water inside is maintained at a predetermined water level.

  A lower portion of the distillation furnace 1 is formed in a truncated cone shape projecting downward, and an empty chamber 7 isolated from the inside of the distillation furnace 1 is formed in an outer peripheral portion of the truncated cone shape. The vacant chamber 7 communicates with the inside of the dry distillation furnace 1 through a plurality of air supply nozzles 8 provided on the inner wall portion of the dry distillation furnace 1.

  A dry distillation oxygen supply path 9 is connected to the empty chamber 7 below the dry distillation furnace 1. The dry distillation oxygen supply path 9 is connected via an air supply path 10 to an air supply source 11 constituted by a pushing fan or the like. A control valve 12 is provided in the dry distillation oxygen supply path 9, and the opening degree of the control valve 12 is controlled by a valve driver 13. In this case, the valve driver 13 is controlled by a control device 14 configured by an electronic circuit including a CPU and the like.

  Furthermore, an ignition device 15 for igniting the waste A stored in the dry distillation furnace 1 under the control of the control device 14 is attached to the lower side of the dry distillation furnace 1. The ignition device 15 is composed of an ignition burner or the like, and supplies a combustion flame to the waste A by burning the fuel supplied from the fuel supply device 16 in which fuel such as heavy oil is stored through the fuel supply path 17. To do.

  The combustion furnace 3 includes a mixing unit 18 into which a combustible gas introduced from the dry distillation furnace 1 is introduced, a burner unit 19 that communicates with the mixing unit 18, and a combustion unit 20 that communicates with the burner unit 19.

  The mixing unit 18 includes a bottomed cylindrical mixer main body 18a, a gas introduction pipe 18b for introducing a combustible gas coaxially with the central axis of the mixer main body from the bottom of the mixer main body 18a, and the mixer main body 18a. An oxygen introduction port for introducing high-concentration oxygen into the inside from the side portion, an oxygen introduction port 18c for generating a vortex-like oxygen flow rotating around the axis of the gas introduction pipe 18b, and a burner portion from the mixer body 18a 19 has a gas supply port 18 d for supplying a mixed gas of a combustible gas and oxygen to 19.

  The mixer main body 18a is made of a steel material, and the combustible gas and high-concentration oxygen described later are mixed in the mixer main body 18a according to the gas amount of the combustible gas generated from the dry distillation furnace 1 in the diameter and the total length. Designed to mix in.

  The gas introduction pipe 18b is connected to the gas passage 2 at the rear end thereof, and the combustible gas generated by the carbonization of the waste A in the carbonization furnace 1 passes through the gas passage 2 from the tip of the gas introduction pipe 18b to the mixer main body. 18a.

  A high-concentration oxygen supply source 21 configured by, for example, an oxygen cylinder capable of supplying high-concentration oxygen having an oxygen concentration of 90% or more is connected to the oxygen introduction port 18c via an oxygen supply path 22. A control valve 23 is provided in the oxygen supply path 22, and the opening degree of the control valve 23 is controlled by a valve driver 24. The valve driver 24 is controlled by the control device 14.

  The high-concentration oxygen supply source 21 and the oxygen supply path 22 correspond to the first oxygen supply unit of the present invention, and the control valve 23, the valve driver 24, and the control device 14 correspond to the supply control unit of the present invention. .

  The gas supply port 18d is configured so that a mixed gas (first mixed gas) of combustible gas and high-concentration oxygen mixed in the mixer main body 18a has a supply flow rate to the burner unit 19 from a flow rate at which flashback occurs. The shape of the mixer main body 18a is reduced in diameter so that the flow velocity is larger than a flow velocity at which the combustion of the first mixed gas in the burner portion 19 is inhibited.

  A vacant chamber 25 isolated from the inside of the burner portion 19 is formed on the outer peripheral portion of the burner portion 19, and the vacant chamber 25 is formed in the inner periphery of the burner portion 19 through a plurality of nozzle holes 26. It communicates with the inside. A combustion air supply path 27 branched from the air supply path 10 is connected to the vacant chamber 25, and air supplied from the air supply source 11 is introduced into the burner unit 19 from the nozzle hole 26 of the vacant chamber 25. A control valve 28 is provided in the combustion air supply passage 27, and the opening degree of the control valve 28 is controlled by a valve driver 29. The valve driver 29 is controlled by the control device 14.

  In the burner part 19, when the high concentration oxygen is supplied in the mixer main body 18a by the control apparatus 14, the 1st mixed gas produced | generated by it burns. Further, in the burner unit 19, when high-concentration oxygen is not supplied into the mixer main body 18 a by the control device 14 and air is supplied into the burner unit 19, combustible gas and air are supplied in the burner unit 19. A mixed gas (second mixed gas) mixed with is generated, and the generated second mixed gas burns.

The air supply source 11 and the combustion air supply path 27 correspond to the second oxygen supply means of the present invention,
The control valve 28, the valve driver 29, and the control device 14 correspond to the supply control means of the present invention.

  In the combustion unit 20, the first mixed gas or the second mixed gas that has started to burn in the burner unit 19 is introduced, and the combustion is continuously and spatially spread. As a result, in the combustion unit 20, the gas in the combustion unit 20 stays for a certain period of time at a predetermined temperature (800 ° C.) or higher at which dioxins are decomposed.

  Below the combustion unit 20 is a combustion device 31 that is controlled by the control device 14 and burns fuel such as heavy oil supplied from the fuel supply device 16 via the fuel supply passage 30 branched from the fuel supply passage 17. It is attached. The combustion device 31 is constituted by an ignition burner or the like, and burns while adjusting the fuel supply amount in stages. Further, the combustion device 31 is also used as necessary when igniting the first mixed gas or the second mixed gas introduced into the burner unit 19 by the flame.

  A shutter 31a that is opened and closed by an actuator (not shown) or the like is provided between the combustion device 31 and the combustion unit 20, and the shutter 31a is opened when the combustion device 31 is operated, and is closed when the combustion device 31 is not operated. Is done. Thereby, the shutter 31a is protected from the high temperature combustion part 20. FIG.

  A cooling furnace (hot water boiler) 32 that cools the combustion exhaust gas burned in the combustion furnace 3 is attached to the tip of the combustion part 20. The cooling furnace 32 is supplied with water by a water supply device (not shown), and hot water heated in the cooling furnace 32 using the combustion heat of waste can be used for air conditioning or the like.

  On the outlet side of the cooling furnace 32, a duct 33 a that discharges the cooled combustion exhaust gas is provided, and the duct 33 a is connected to one end of the cooling tower 34.

  The cooling tower 34 is provided with a spray 34a for spraying the combustion exhaust gas from the cooling furnace 32, and a water supply device (not shown) for supplying cooling water to the spray 34a and an air compressor are connected to the cooling tower 34.

  The other end of the cooling tower 34 is connected to one end of the bag filter 35 via a duct 33b, and slaked lime 35a and activated carbon 35b are mixed in the combustion exhaust gas sent from the cooling tower 34 to the bag filter 35. Desulfurization and deodorization are performed.

  The bag filter 35 includes a filter unit (not shown) and a recovery unit that recovers ash and the like separated from the exhaust gas by the filter unit, and an air compressor for cleaning the filter unit is connected to the filter unit.

  The other end of the bag filter 35 is connected to the chimney 36 via a duct 33c. An induction fan 37 is provided between the bag filter 35 and the chimney 36 to attract the combustion exhaust gas in the combustion furnace 3 to the chimney 36 through the ducts 33 a to 33 c, and from the chimney 36 through the induction fan 37. Combustion exhaust is discharged into the atmosphere. The induction fan 37 is controlled by the control device 14 so that the pressure for attracting the combustion exhaust in the combustion furnace 3 becomes a desired pressure corresponding to the operation state of the device. Sensors for detecting a hydrogen chloride concentration and a carbon monoxide concentration (not shown) are attached to the exit of the chimney 36, respectively, and the hydrogen chloride concentration and the carbon monoxide concentration of the combustion exhaust exhausted from the chimney 36 are detected. Be monitored.

Further, in the apparatus of the present embodiment, the lower portion of the dry distillation furnace 1 is attached a temperature sensor 38 for detecting the temperature T ₁ of in the dry distillation furnace 1, the temperature in the combustion furnace 3 at the bottom of the combustion furnace 3 T ₂ A temperature sensor 39 is attached to detect this. Detection signals from the temperature sensors 38 and 39 are input to the control device 14.

  Next, a waste incineration method using the apparatus of this embodiment will be described with reference to FIGS. 1 and 2.

  In the apparatus shown in FIG. 1, when the waste A is incinerated, first, the charging door 4 of the dry distillation furnace 1 is opened, and the waste A is charged into the dry distillation furnace 1 from the charging port 5. The waste A is mixed with various wastes mainly waste paper, waste wood, waste plastic, etc., and the combustible gas generated by the dry distillation in the dry distillation furnace 1 is stably burned. The combustion temperature is adjusted to have a calorific value of 800 ° C. or higher, and in this embodiment, the combustion temperature is further adjusted to have a calorific value of 850 ° C. or higher.

Next, after the charging door 4 is closed and the inside of the dry distillation furnace 1 is sealed, the combustion device 31 of the combustion furnace 3 is operated by the control device 14 prior to the ignition of the waste A, whereby the combustion of the fuel is performed. Start warm-up operation. Specifically, in the graph showing the time change shown in FIG. 2, the combustion of the fuel is started at time t _0.

Next, the temperature T in the combustion furnace 3 gradually rises due to the combustion of the fuel. When the temperature T detected by the temperature sensor 39 exceeds 800 ° C. at time t ₁ , the controller 14 ignites the ignition apparatus of the dry distillation furnace 1. 15 is activated, the waste A is ignited, and an auxiliary combustion operation is started in which combustible gas generated by partial combustion of the waste A is burned together with the fuel in the combustion furnace 3.

  In the auxiliary combustion operation at the time of ignition, as shown in FIG. 2, the control valve 23 of the oxygen supply path 22 is gradually opened by the control device 14. As a result, the combustible gas introduced from the dry distillation furnace 1 into the mixing unit 18 and the high concentration oxygen supplied from the oxygen supply source 21 are mixed in the mixer body, and the generated first mixed gas is burner unit 19. Supplied to. Then, the first mixed gas supplied to the burner unit 19 starts to burn in the burner unit 19 by the flame of the combustion device 31 and is attracted to the combustion unit 20.

  In this auxiliary combustion operation, when the temperature detected by the temperature sensor 39 in the combustion furnace 3 is 800 ° C. or lower, the combustion device 31 is operated to maintain the temperature in the combustion furnace above 800 ° C. As a result of the operation of the combustion device 31, the temperature in the combustion furnace 3 fluctuates finely around 800 ° C. as shown in FIG. 2, and the fuel is consumed according to the operation of the combustion device 31.

Here, by burning the combustible gas using high-concentration oxygen instead of air, it is possible to suppress the amount of heat absorbed by the nitrogen component in the air and save time and fuel required for auxiliary combustion. Specifically, as shown in FIG. 2, the time t ₂ at the end of the auxiliary combustion operation when the auxiliary combustion is performed using high-concentration oxygen is the time t ₂ ′ at the end of the auxiliary combustion operation when the auxiliary combustion operation is performed using air. As compared with the above, it can be shortened to about 1/5 to 1/6. In addition, the fuel required for auxiliary combustion can be saved to about 1/5 to 1/6.

Next, when the auxiliary combustion operation ends at time t ₂ , the temperature in the combustion furnace 3 rises as the amount of combustible gas supplied from the dry distillation furnace 1 increases, and the temperature sensor 39 in the combustion furnace 3 increases. When the detected temperature reaches a predetermined temperature (for example, 1000 ° C.) at time t ₃ , the supply of oxygen to the combustion furnace 3 is switched from high-concentration oxygen to air.

Specifically, as shown in FIG. 2, at the same time narrowing the control valve 23 provided at time t ₃ to the oxygen supply path 22 by opening the control valve 28 provided in the air supply passage 27, combustion The supply of oxygen to the furnace 3 is switched from high-concentration oxygen to air. At this time, the valve opening degree of the control valve 28 of the air supply path 27 is adjusted so that the amount of oxygen necessary for maintaining the combustion of the combustible gas becomes equal to that when the high-concentration oxygen is supplied. Precisely, the valve opening degree of the control valve 28 of the air supply path 27 is adjusted so that five times as much air as the supply amount of high-concentration oxygen is supplied to the burner unit 19.

  The reason why five times the high concentration oxygen is supplied is that the oxygen contained in the air is about 1/5 of its volume. Thereby, the amount of oxygen required to maintain the combustion of the combustible gas can be maintained.

  The air supplied from the air supply path 27 to the vacant chamber 25 of the burner unit 19 is introduced into the burner unit 19 from the nozzle hole 26 and discharged from the gas introduction pipe 18 b of the mixing unit 18 to be in the burner unit 19. Is mixed with the combustible gas introduced into the gas to produce a second mixed gas. The generated second mixed gas is spontaneously combusted by the flame in the combustion furnace 3 or its ambient temperature, so that the combustion state is continuously taken over from the combustion by the first mixed gas to the combustion by the second mixed gas.

Time t ₃ or later, the combustion by the second mixed gas, the temperature in the combustion furnace 3 is reduced, is maintained at about 850 ° C.. Thereby, while being able to suppress that the temperature in the combustion furnace 3 becomes high temperature, the consumption of high concentration oxygen can be saved.

Even time t ₃ or later (without switching the supply of oxygen to the combustion furnace 3 to the air from a high concentration of oxygen), the supply of oxygen to the combustion furnace 3 is maintained to a high concentration of oxygen, the temperature in the combustion furnace 3 May be maintained at 1000 ° C. In this case, the consumption of high-concentration oxygen cannot be saved, but there is no nitrogen component and the combustion exhaust amount can be reduced.

  As described above in detail, according to the dry distillation gasification incineration processing apparatus of this embodiment, when combustible gas is burned with high-concentration oxygen having a volume smaller than that of air, it is provided upstream of the burner portion. The combustible gas and high-concentration oxygen are mixed by the mixed portion. Therefore, high-concentration oxygen having a small volume can be sufficiently mixed with the combustible gas in the mixing portion having a smaller diameter than the burner portion, and by supplying the first mixed gas to the burner portion at a predetermined flow rate, the combustion furnace Thus, the first mixed gas can be combusted stably.

  On the other hand, when the combustible gas is burned with the large volume of air, the combustible gas and the air are directly mixed in the burner portion so that the second mixed gas can be stably burned in the combustion furnace 3. it can.

  At the time of the auxiliary combustion operation, combustion of the combustible gas with the high-concentration oxygen in the combustion furnace 3 can suppress the absorption of heat by the nitrogen component in the air, and the auxiliary combustion operation can be completed in a short time. Saving time and fuel.

  Furthermore, after the temperature in the combustion furnace 3 rises due to the combustion of the combustible gas with high-concentration oxygen, the temperature in the combustion furnace 3 is increased by switching the combustion of the combustible gas from high-concentration oxygen to air. It can be suppressed and consumption of high concentration oxygen can be saved.

  Thus, according to the dry distillation gasification incineration processing apparatus of this embodiment, combustible gas can be stably burned in a combustion furnace, and time and fuel required for auxiliary combustion can be saved.

  In the present embodiment, an oxygen cylinder is used as the high-concentration oxygen supply source 21, but the present invention is not limited to this, and a known oxygen generator or the like may be used.

  In the present embodiment, the combustible gas introduced from the dry distillation furnace 1 to the combustion furnace 3 is mixed with high-concentration oxygen in the mixing unit 19 or mixed with air in the burner unit 19. When the gas is mixed with only high-concentration oxygen and burned, the burner unit 19 can be omitted. In this case, since the combustion exhaust amount becomes small, the structure after the combustion furnace 3 can be reduced in size, and the introduction cost and maintenance cost of the apparatus can be reduced.

DESCRIPTION OF SYMBOLS 1 ... Dry distillation furnace, 3 ... Combustion furnace, 14 ... Control apparatus (supply switching means), 18 ... Mixing part, 18a ... Mixer main body, 18b ... Gas introduction pipe, 18c ... Oxygen introduction port, 18d ... Gas supply port, 19 DESCRIPTION OF SYMBOLS ... Burner part, 20 ... Combustion part, 22 ... Oxygen supply path (1st oxygen supply means), 27 ... Air supply path (2nd oxygen supply means), A ... Waste.

Claims (2)

A combustible gas for storing combustible gas and combusting a part of the waste material to dry the remainder of the waste material with the combustion heat to generate combustible gas, and combustible gas introduced from the combustible gas furnace A combustion furnace for combusting, a combustion oxygen supply means for supplying the combustion furnace with oxygen required for combustion of the combustible gas introduced into the combustion furnace, a combustion furnace temperature detection means for detecting the temperature in the combustion furnace, Oxygen supply to the dry distillation furnace so that the temperature in the combustion furnace detected by the combustion furnace temperature detecting means after the combustion of the combustible gas in the combustion furnace is started is maintained at a preset temperature. A dry distillation gasification incineration apparatus comprising a dry distillation oxygen supply means for supplying oxygen necessary for combustion of a part of the waste to the dry distillation furnace while adjusting the amount,
The combustion oxygen supply means includes a first oxygen supply means for supplying high-concentration oxygen having an oxygen concentration of 90% or more, a second oxygen supply means for supplying air, and oxygen supply to the combustion furnace. Supply control means for switching between one oxygen supply means and the second oxygen supply means,
Until the supply control means reaches a predetermined temperature higher than the set temperature set as a temperature higher than the temperature at which the combustion of dioxins can be thermally decomposed by combustion of only combustible gas , Combustible gas is burned with high-concentration oxygen from the first oxygen supply means to raise the temperature of the combustion furnace, and when the predetermined temperature is reached as a trigger, supply of oxygen to the combustion furnace is performed. Switching from the first oxygen supply means to the second oxygen supply means,
The predetermined temperature is the temperature of the combustion furnace becomes the predetermined temperature, and the supply control means switches the supply of oxygen to the combustion furnace from the first oxygen supply means to the second oxygen supply means. Is set a predetermined amount higher than the set temperature so that the temperature drop of the combustion furnace due to
In the combustion furnace, a combustible gas introduced from the dry distillation furnace is introduced, a high concentration oxygen is supplied from the first oxygen supply means, and the second oxygen is communicated with the mixing part. Having a burner section to which air is supplied by the supply means, and a combustion section communicating with the burner section;
The mixing unit has a high concentration supplied by the combustible gas and the first oxygen supply means when the supply control means switches the supply of oxygen to the combustion furnace to the first oxygen supply means. Mixing with oxygen to produce a first gas mixture,
The burner unit combusts the first mixed gas generated by the mixing unit when the supply control unit switches the supply of oxygen to the combustion furnace to the first oxygen supply unit, and When supply of oxygen to the combustion furnace is switched to the second oxygen supply means by the supply control means, the combustible gas and the air supplied by the second oxygen supply means are mixed to perform second mixing. Generating gas, burning the generated second mixed gas,
In the combustion part, the first mixed gas or the second mixed gas that has started combustion in the burner part is introduced, and the combustion is continued,
The supply port of the first mixed gas of the mixing unit to the burner unit has a supply flow rate of the first mixed gas to the burner unit larger than a flow rate at which flashback occurs, and the first mixing in the burner unit A dry distillation gasification incineration apparatus, characterized in that it is formed to have a flow rate in a predetermined range smaller than a flow rate at which gas combustion is inhibited. In the dry distillation gasification incineration processing device according to claim 1,
The mixing unit includes a cylindrical mixer main body, a gas introduction pipe for introducing the combustible gas coaxially with a central axis of the mixer main body from one end of the mixer main body, and the first oxygen supply unit. An oxygen inlet for introducing the high-concentration oxygen into the mixer body so that the supplied high-concentration oxygen forms a vortex-like oxygen flow rotating about the axis of the gas introduction pipe; and the other end of the mixer body And a gas supply port for supplying the first mixed gas to the burner section.

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