JP2008281316A - Carbide combustion equipment and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide waste-based fine powder carbide combustion equipment and its method capable of restraining slagging and generation of NOx. <P>SOLUTION: This fine powder carbide combustion equipment of a waste-based material has a furnace having a combustion area for burning waste-based fine powder carbide and a burner for jetting and burning the finer powder carbide of the waste-based material in the furnace, and is provided with the burner in a furnace inlet part. A first swirling flow forming means for forming a swirling flow of air by blowing the air in the furnace, is arranged on the burner downstream side in the combustion gas flowing direction in the furnace. A gas supply means for forming a swirling flow or a counterflow of low oxygen gas by blowing the low oxygen gas in the furnace, is arranged on the downstream side of the first swirling flow forming means. When forming the swirling flow by the gas supply means, the swirling flow area of the air formed by the first swirling flow forming means, is formed larger than the swirling flow area of the low oxygen gas formed by the gas supply means. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a combustion apparatus and method for burning waste-based fine carbide, and suppresses slugging in the furnace when burning waste-based fine carbide, thereby reducing fly ash adhesion on the furnace inner wall. In addition, the present invention relates to a waste-based fine carbide combustion apparatus capable of suppressing NOx generation and a method thereof.

  Conventionally, in industrial thermal power generation facilities, boilers that generate high-temperature, high-pressure steam by burning solid fuel such as pulverized coal, sludge, biomass, etc. are used, and the turbine is driven by the steam generated by the boiler. Electricity is generated by a generator connected to the turbine. Thus, in boilers used in thermal power generation facilities, reduction of NOx in exhaust gas is required from the viewpoint of environmental protection.

  Therefore, as a method for reducing NOx in exhaust gas and improving combustion efficiency, a fuel combustion burner for supplying fuel and air to a boiler and an air supply port for supplying air to the downstream side of the fuel combustion burner are provided. There is known a so-called two-stage combustion system in which the air input from the fuel combustion burner is made smaller than the amount of air necessary for complete combustion of the fuel and the remaining air is input from the air supply port. By using the two-stage combustion method, it is possible to form a reducing atmosphere and suppress the generation of NOx.

However, in the two-stage combustion method, when coal or carbide is used as the fuel and the combustion temperature is high, the ash content in the fuel melts and ash adheres to the inner wall of the furnace, that is, there is a high possibility that slagging occurs. .
Therefore, Patent Document 1 discloses a method for preventing slagging by introducing air into a position where slagging is likely to occur and lowering the gas temperature below the ash melting point, and Patent Document 2 discloses the minimum necessary separately from the furnace. Disclosed is a method of providing a partial combustion furnace that performs preliminary partial combustion with an amount of high-temperature combustion air, and confining fly ash in the partial combustion furnace to inject only combustion gas that does not produce fly ash in the furnace. .

JP 2002-349846 A JP 2005-265300 A

  However, in any of the techniques disclosed in Patent Documents 1 and 2, the entire boiler furnace is composed of a boiler wall, and the effect of suppressing slagging is sufficient when the inner wall of the furnace is simply provided with a refractory material. Therefore, a combustion furnace and a boiler that generates high-temperature and high-pressure steam cannot be installed separately. Furthermore, in the case of a small-scale low-pressure boiler (about 3 Mpag × 300 ° C.), the integrated structure is expensive.

  Further, the fuel load is changed by increasing / decreasing the number of burners used, and a plurality of burners are required, resulting in high costs. Further, if a plurality of furnaces are provided in accordance with the load, the cost is similarly increased, and it becomes difficult to design a rational furnace. Furthermore, when the fuel load is changed, steam is produced with a boiler when the load is small, and steam is produced with a boiler when the load is maximum, and at the same time, hot air is produced with a high-temperature air preheater. Cannot operate.

  Therefore, in view of the problems of the prior art, the present invention can separately install a furnace and a boiler with a refractory structure as a furnace wall. Therefore, by changing the load in one furnace configuration, it is possible to produce high-temperature air simultaneously with steam production. Furthermore, an object of the present invention is to provide a waste-based fine carbide combustion apparatus and method that can suppress generation of slagging and NOx.

  In order to solve the above-described problems, the present invention includes a furnace having a combustion region for burning waste-based fine carbide, and a burner for injecting and burning fine-carbon carbide of waste-based material into the furnace, In the pulverized carbide combustion apparatus for waste materials provided at the furnace inlet, air is blown into the furnace downstream of the burner along the combustion gas flow direction in the furnace to form a swirling flow of air. A first swirl flow forming means and a gas supply means for blowing a low oxygen gas into the furnace to form a swirl flow or a counter flow of the low oxygen gas downstream of the first swirl flow formation means; When the swirl flow is formed by the gas supply means, the swirl flow area of the air formed by the first swirl flow formation means is the swirl of the low oxygen gas formed by the gas supply means. Characterized by being larger than the area.

  Here, finely divided carbide refers to a finely divided carbide, specifically, a granular carbide having a particle size of 74 μm or less and 90% or more.

According to the present invention, the first swirl flow forming means for forming the swirl flow of air by blowing air into the furnace downstream of the burner along the combustion gas flow direction is provided by the swirl flow. It is possible to prevent the combustion fly ash from adhering to the furnace ceiling wall, and to reduce the combustion gas temperature in the vicinity of the swirling flow and the furnace inner wall temperature, thereby effectively suppressing slugging.
The temperature of the air blown into the furnace by the first swirl flow forming means is not particularly limited, but the temperature of the combustion gas near the swirl flow and the furnace inner wall temperature can be effectively lowered and the temperature of the air is adjusted. It is preferable to use air at room temperature (about 20 to 50 ° C.) that does not need to be used. Further, the area of the swirl flow is not particularly limited, but it is preferably about 30 to 60% with respect to the cross-sectional area of the furnace.

Further, by providing a gas supply means for blowing a low oxygen gas into the furnace downstream of the first swirl flow forming means along the combustion gas flow direction to form a swirl flow or a counter flow of the low oxygen gas, Oxygen gas swirl flow or counterflow can lower the furnace inner wall temperature and can effectively suppress slagging, and low oxygen gas and combustion gas are mixed by swirl flow or counterflow to locally burn the combustion gas temperature. Therefore, NOx can be reduced as compared with the case where low oxygen gas is not mixed. At the same time, the furnace inner wall temperature can be lowered by mixing low oxygen gas, and slugging can be effectively suppressed. Since waste-based fine carbides are more flammable than coal or the like, even if low oxygen gas is blown to form a swirl flow, it can be burned without hindering combustion with low oxygen gas.
In addition, the gas temperature blown into the furnace by the gas supply means is not particularly limited, but it is effective to use a low oxygen gas of about 200 ° C. in order to prevent combustion and reduce the temperature of the combustion gas. is there. When the low oxygen gas blowing is a swirling flow, the area of the swirling flow is not particularly limited as long as the area is smaller than the swirling flow of air formed by the first swirling flow forming means.

  Thus, by providing the first swirl flow forming means and the second gas supply means, it is possible to suppress slagging and reduce NOx without using the furnace wall as a boiler wall. Therefore, it is possible to provide a refractory structure and to install a furnace and a boiler separately.

  Further, when the gas supply means is provided in multiple stages in the flow direction of the combustion gas in the furnace, and the swirling flow or counterflow of the low oxygen gas formed by the second gas supply means is multistage, the low oxygen gas and the combustion Slow mixing of the gas is further promoted, so NOx can be reduced more efficiently.

Further, the first swirl flow forming means blows the air in a tangential direction of the first virtual circle in a plane perpendicular to the flow direction of the combustion gas in the furnace, and follows the first virtual circle A swirling flow of air is formed.
By blowing air in the tangential direction of the first virtual circle in a plane perpendicular to the flow direction of the combustion gas in the furnace, the swirl flow along the first virtual circle can be generated extremely stably. . By blowing air in a tangential direction of the first virtual circle from a plurality of locations, it is possible to generate a swirl flow more stably.

When the swirl flow is formed by the gas supply means, the low oxygen gas is blown in a tangential direction of a second virtual circle in a plane perpendicular to the flow direction of the combustion gas in the furnace, A swirling flow of low oxygen gas along a virtual circle is formed.
By generating low-oxygen gas in a tangential direction of the second virtual circle in a plane perpendicular to the flow direction of the combustion gas in the furnace, a swirl flow along the second virtual circle is generated extremely stably. Can do. When low oxygen gas is blown in a tangential direction of the second imaginary circle from a plurality of locations, a swirl flow can be generated more stably.

Further, a means for injecting urea or ammonia into the furnace is provided downstream of the gas supply means in the flow direction of the combustion gas.
Thus, NOx can be further reduced by ammonia or urea.

  Further, in a waste-based fine carbide combustion method in which a waste-based fine carbide is jetted and burned by a burner provided at the furnace inlet to a furnace having a combustion region for burning the waste-based fine carbide, in comparison with the burner. Air is blown to the downstream side in the combustion gas flow direction in the furnace so as to form a swirl flow of air, and the swirl flow of the low oxygen gas or opposite to the downstream side in the combustion gas flow direction than the swirl flow of the air. When the low oxygen gas is blown so as to form a flow and the low oxygen gas is blown so as to form a swirling flow, the swirling flow area of the air is larger than the swirling flow area of the low oxygen gas. And

  Furthermore, the low oxygen gas is blown in multiple stages in the flow direction of the combustion gas, and the swirling flow of the low oxygen gas is made multiple stages.

  In addition, the air is blown in a tangential direction of a first virtual circle in a plane orthogonal to the flow direction of the combustion gas to form a swirling flow of air along the first virtual circle in the furnace. Features.

  Further, when the low oxygen gas is blown so as to form a swirling flow, the low oxygen gas is blown in a tangential direction of a second virtual circle in a plane orthogonal to the flow direction of the combustion gas, and the low oxygen gas is injected into the furnace. A swirling flow of low oxygen gas along the second virtual circle is formed.

  Furthermore, urea or ammonia is blown into the downstream side in the flow direction of the combustion gas from the swirling flow or counterflow of the low oxygen gas.

  As described above, according to the present invention, the furnace wall and the boiler can be individually installed in order to make the furnace wall refractory structure. In addition, it is possible to provide a waste-based fine carbide combustion apparatus and method that can further suppress the generation of slagging and NOx.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

  FIG. 1 is an overall configuration diagram of a cogeneration system for a carbonization furnace using a waste-based fine carbide combustion apparatus of the present invention, FIG. 2 is a schematic diagram showing a carbide supply facility in FIG. 1, and FIG. FIG. 4 is a cross-sectional view taken along line AA in FIG. 3, and FIG. 5 is a cross-sectional view taken along line BB in FIG. Hereinafter, a cogeneration system for a carbonization furnace as an example using the waste-based fine carbide combustion apparatus of the present invention will be described with reference to FIGS. 1 and 2, and the waste system of the present invention will be described with reference to FIGS. The fine carbide combustion apparatus will be described.

  FIG. 1 shows a combined heat and power generation system for a carbonization furnace using the waste-based fine carbide combustion apparatus of the present invention. The system according to the present embodiment includes an asphalt production plant 140, a carbonization furnace 104 attached to the asphalt production plant 140, a gas combustion apparatus 1b for combusting pyrolysis gas from the carbonization furnace 104, and a fine powder carbide obtained by pulverizing carbide. , A boiler 106 that recovers heat from high-temperature combustion gas, a power generation facility 112 that generates power using high-temperature steam generated in the boiler 106, a gas combustion apparatus 1b, and a fine-carbide combustion apparatus The air preheater 107 which manufactures high temperature air using a part of combustion exhaust gas from 1 is made into a main structure. In the present embodiment, the asphalt manufacturing plant 140 is configured as an example, but the present invention is not limited thereto, and other hot air utilization facilities may be configured.

The flow of this system will be described together with the specific configuration of each device.
The receiving supply facility 101 is supplied with a workpiece to be pyrolyzed and gasified in the carbonization furnace 104. Biomass 120 such as plants, waste wood, agricultural waste, livestock manure, sewage sludge, etc. are listed as the objects to be treated, but in particular waste such as residual materials, building waste derived wood chips, building waste materials, demolition materials, thinning materials, etc. Based biomass is preferred.
The biomass 120 supplied from the receiving supply facility 101 is conveyed on the input conveyor 102 and is quantitatively input from the screw feeder 103 into the carbonization furnace 104.
The carbonization furnace 104 is an externally heated rotary kiln that heats the inside of the furnace by indirect heating. The carbonization furnace 104 is a device in which a heating jacket is provided around the furnace, and the biomass 120 in the carbonization furnace 104 is heated by circulating a high-temperature combustion gas 121 through the heating jacket. The externally heated rotary kiln can pyrolyze and gasify biomass with a small amount of fly ash generated. Moreover, since it is an indirect heating type, since the oxygen concentration inside the kiln where biomass stays can be kept at a very low value and uniform heating is possible, high-calorie and uniform carbide 123 is produced. Can do.

The pyrolysis gas 122 generated by carbonization in the carbonization furnace 104 is guided to the gas combustion device 1b. In the gas combustion apparatus 1b, the pyrolysis gas 122 is combusted while supplying the combustion air 124, and the high-temperature combustion gas 121 is generated.
At the same time, the carbide 123 produced in the carbonization furnace 104 is guided to the carbide combustion device 1 and burns the carbide 123 while supplying the combustion air 124 in the same manner as the gas combustion device 1b, thereby generating a high-temperature combustion gas 121. The auxiliary fuel 125 is used when the combustion chamber is heated.
In the present embodiment, the pyrolysis gas 122 and the carbide 123 generated in the carbonization furnace 104 are combusted in separate combustion devices 1 and 2, but the present invention is not limited to this. The pyrolysis gas 122 and the carbide 123 may be burned in the combustion chamber to generate the high temperature combustion gas 121. Further, it is preferable that the combustion apparatuses 1 and 2 perform exhaust gas circulation to control the combustion chamber outlet temperature of the high-temperature combustion gas 121 and simultaneously suppress the generation of NOx in the exhaust gas by slow combustion.

  Here, a process until the carbide 123 is supplied from the carbonization furnace 104 to the carbide combustion apparatus 1 is shown in FIG. The carbide 123 discharged from the carbonization furnace 104 is transferred while being air-cooled on the cooling conveyor 151 and stored in the carbide hopper 152. The carbide stored in the carbide hopper 152 is appropriately fed to the magnetic separator 153, and foreign substances such as metal are separated and removed by the magnetic separator 153. The carbide from the magnetic separator 153 is supplied to the pulverizer 154 and pulverized, and is stored in the pulverized carbide hopper 155 as fine pulverized carbide with a particle size of 74 μm or less being 90% or more. The fine carbides stored in the fine carbide hopper 155 are transported in the vapor phase to the carbide combustion device 1 by a fixed amount feeder 156 by a predetermined amount, and are supplied into the carbide combustion device 1 from the powder burner.

A part of the high-temperature combustion gas 121 generated in this way is supplied to the heating jacket of the carbonization furnace 104 and used for indirect heating of the carbonization furnace 104. At least a part of the other high-temperature combustion gas 121 is supplied to the boiler 106, and the boiler 106 generates high-temperature steam 127 using the sensible heat of the high-temperature combustion gas 121. The generated high-temperature steam 127 is guided to the power generation facility 112 provided in the boiler 106 and used for power generation. The electric power generated here may be supplied to the other while supplying the necessary power for operation of the asphalt manufacturing plant 140.
Moreover, it is preferable to supply a part of high-temperature steam produced | generated with the boiler 106 to the carbide | carbonized_material 123, and it utilizes for prevention of a fine particle scattering or cooling.
The exhaust gas after heat recovery in the boiler 106 is introduced into the heater 107, and other low-temperature exhaust gas 135 is heated by heat exchange, and then introduced into the temperature reducing tower 108 and cooled by spraying the cooling water 132. The cooled exhaust gas 133 is neutralized with an acid gas such as NOx and HCl by the supply of slaked lime 134, introduced into the bag filter 109, and dedusted. Fly ash 128 collected by the boiler 106, the heater 107, the temperature reducing tower 108, and the bag filter 109 is processed by a fly ash treatment facility (not shown).

The exhaust gas discharged from the bag filter 109 is cooled and wet-cleaned by the cooling water 136 and the makeup water 137 in the smoke-washing tower 113, and the caustic soda 138 is sprayed to remove SO _x , HCl, and the like. The cleaned exhaust gas 135 is heated via the heater 107, then NOx is removed by supplying ammonia 139 in the denitration reactor 110, and released from the chimney 111 to the atmosphere. A part of the exhaust gas heated by the heater 107 is supplied to the carbide combustion device 1 or the gas combustion device 1b. In addition, according to the property of exhaust gas, it can also be set as the structure which does not comprise the smoke-wash tower 113, the denitration reaction tower 110, and the heater 107, and these apparatus structures can be selected suitably.

Further, the exhaust gas after heat recovery by the boiler 106 can be processed by the process shown in FIG. FIG. 6 shows a configuration diagram of another processing system for exhaust gas after heat recovery by the boiler 106. The exhaust gas after heat recovery in the boiler 106 is introduced into the temperature reducing tower 208 and cooled by spraying the cooling water 232. The cooled exhaust gas 233 is neutralized with NOx, HCl, or other acidic gas by the supply of slaked lime 234, and is introduced into the bag filter 209 for dust removal. The fly ash 228 collected by the boiler 106, the temperature reducing tower 208, and the bag filter 209 is processed by a fly ash treatment facility (not shown).
The exhaust gas discharged from the bag filter 209 is cooled and wet-cleaned by the cooling water 236 and the makeup water 237 in the smoke-washing tower 213, and the caustic soda 238 is sprayed to remove SO _x , HCl, and the like. The cleaned exhaust gas 235 is heated through the exhaust gas heater 207, then NOx is removed by supplying ammonia 239 in the denitration reactor 210, and is released into the atmosphere from the chimney 211 through the fan 212.

On the other hand, at least part of the high-temperature combustion gas 121 generated by the gas combustion device 1 b and the carbide combustion device 1 is supplied to the air preheater 107. The air preheater 107 exchanges heat between the air 149 and the high-temperature combustion gas 121 to generate high-temperature air 147. The combustion gas reduced in temperature by heat exchange is fed to the rear stage of the heater 107 and processed together with other exhaust gas.
The clean high-temperature air 147 generated by the air preheater 107 is supplied to the asphalt production plant 140 and supplied to a dryer or the like at the plant. In the asphalt production plant 140, aggregate 141, air 142, fuel 143 such as kerosene is supplied to produce asphalt products 144 such as asphalt composites, etc. It becomes possible to reduce the auxiliary combustion. Moreover, since the high-temperature air 147 is clean air generated by exchanging the air 149 in the air preheater 107 while using the heat source of the carbonization furnace 104, impurities are mixed into the manufactured asphalt product. No high quality products can be manufactured.

As described above, in the cogeneration system for a carbonization furnace described with reference to FIGS. 1 and 2, the waste-based fine carbide combustion apparatus of the present invention is used as the carbide combustion apparatus 1. FIG. 3 shows a schematic cross-sectional view of the waste-based fine carbide combustion apparatus of the present invention, FIG. 4 shows a cross-sectional view along AA in FIG. 3, and FIG. 5 shows a cross-sectional view along BB in FIG. The waste-based fine carbide combustion apparatus 1 of the present invention has a vertical shape, and the inside is covered with a refractory material. In the first embodiment, the carbide combustion device 1 has a vertical shape, but the shape is not limited to the vertical shape, and may be, for example, a horizontal shape.
Also, a burner 6 is provided at the inlet, an air injection nozzle 2 is provided on the wall surface below the burner 6, and low oxygen gas injection nozzles 3 and 4 are provided on the wall surface below the air injection nozzle 2 in multiple stages. An ammonia injection nozzle 5 is provided below the low oxygen gas injection nozzle 4. Further, an ash outlet 7 is provided at the bottom, and an exhaust gas outlet is provided below the low oxygen gas injection nozzle 4. In addition, observation windows 9 are provided at various places.

  Next, the action of the fine carbide combustion apparatus 1 of the present invention will be described. First, the finely divided carbide obtained by pulverizing the carbide 123 produced in the carbonization furnace 104 by the pulverizer 154 is stored in the finely divided carbide hopper 155, transported in the vapor phase to the carbide combustion device 1 by the quantitative feeder 156, and then the powder burner 6. To the furnace constituting the carbide combustion device 1 together with the combustion air 124. The pulverized carbide supplied into the furnace 1 together with the combustion air 124 burns while creating a downward combustion gas flow in the furnace. Note that room temperature air is used as the combustion air 124.

  At this time, air is introduced into the furnace from the air injection nozzle 2 provided on the side wall surface of the furnace near the lower side of the burner 6. As shown in FIG. 4, four air injection nozzles 2 (2a, 2b, 2c, and 2d) are provided, and the air injection nozzles 2a, 2b, 2c, and 2d are orthogonal to the combustion gas flow direction in the furnace. Air is blown in the tangential direction of the first virtual circle 20 in the horizontal plane, that is, in the horizontal plane. The air blown into the furnace from the air injection nozzles 2a, 2b, 2c, and 2d forms a swirling flow along the first virtual circle 20 in the furnace. Further, the temperature of the air blown into the furnace from the air injection nozzles 2a, 2b, 2c, and 2d is not particularly limited, but room temperature air is used in this embodiment.

  The swirl flow formed by the air blown from the air injection nozzles 2a, 2b, 2c, and 2d prevents the incineration fly ash generated by the combustion of the fine carbides from rising above the furnace to prevent the incineration flying to the furnace ceiling surface. Prevents adhesion of ash. Further, the generation of slugging is suppressed by swirling air to suppress the combustion gas and the furnace wall temperature in the vicinity of the swirling flow from becoming high.

Further, low oxygen gas is injected into the furnace from the low oxygen gas injection nozzles 3 and 4 provided on the side wall surface of the furnace below the air injection nozzles 2a, 2b, 2c and 2d. Since the low oxygen gas injection nozzles 3 and 4 have the same structure and configuration, only the case where the low oxygen gas swirl flow is formed in the low oxygen gas injection nozzle 3 will be described here. As shown in FIG. 5, four (3a, 3b, 3c, 3d) low oxygen gas injection nozzles 3 are provided, and the combustion gas in the furnace is supplied from each of the low oxygen gas injection nozzles 3a, 3b, 3c, 3d. The low oxygen gas is blown in the direction perpendicular to the flow, that is, the tangential direction of the second virtual circle 30 in the horizontal plane. The low oxygen gas blown into the furnace from the low oxygen gas injection nozzles 3a, 3b, 3c, and 3d forms a swirling flow along the second virtual circle 30 in the furnace. The area of the second virtual circle 30 is not particularly limited as long as it is smaller than the area of the first virtual circle 20. Also, the temperature of the low oxygen gas blown into the furnace from the low oxygen gas injection nozzles 3a, 3b, 3c, 3d is not particularly limited. However, in order to effectively reduce the temperature of the combustion gas without impeding the combustion of fine carbides. It is preferable that the temperature is about 200 ° C. In the case of counterflow blowing, the virtual circle 30 in FIG. 5 is 0% of the furnace cross-sectional area.
Further, the low oxygen gas may be introduced from the outside, and the exhaust gas generated in the fine carbide combustion apparatus 1 may be reused.

  By blowing low oxygen gas from the low oxygen nozzles 3a, 3b, 3c, 3d, the low oxygen gas is mixed with the combustion gas in the furnace, thereby reducing the furnace wall temperature and effectively suppressing slagging. The flame temperature is locally reduced to suppress NOx generation.

  Furthermore, NOx in the combustion gas can be further reduced by introducing ammonia into the furnace from the ammonia nozzle 5 provided on the furnace side wall surface below the low oxygen gas injection nozzle 4.

  Thus, the combustion gas combusted by the fine carbide combustion apparatus 1 is sent from the gas outlet 8 to the boiler 106 and used.

  Also, an ash removal outlet 7 is provided at the lowermost part of the furnace, and the ash removal outlet 7 is closed during normal operation. However, the ash collected at the bottom of the furnace can be extracted when the operation is stopped. It has become.

By using the pulverized carbide combustion apparatus of the present invention, the furnace and the boiler can be individually installed. Therefore, by changing the load in one furnace configuration, it is possible to produce high-temperature air simultaneously with steam production.
Further, in the present embodiment, the carbonization furnace 104, the fine powder combustion apparatus 1 and the gas combustion apparatus 1b are provided one by one. For example, a plurality of the carbonization furnace and the corresponding fine powder combustion apparatus and gas combustion apparatus are provided in parallel. It is possible to recover heat from a plurality of gas combustion devices at a low equipment installation cost by introducing the combustion gas generated in the plurality of fine carbide combustion devices and gas combustion devices into one boiler.

  Since the furnace wall has a refractory structure, the furnace and boiler can be installed separately. By changing the load in one furnace configuration, high-temperature air production is possible at the same time as steam production, and the generation of slagging and NOx is suppressed. It is possible to provide a waste-based pulverized carbide combustion device and a method thereof.

1 is an overall configuration diagram of a cogeneration system for a carbonization furnace using a waste-based fine carbide combustion apparatus of the present invention. It is the schematic which shows the carbide | carbonized_material supply equipment in FIG. It is a schematic sectional drawing which shows the waste type | system | group fine powder carbide combustion apparatus of this invention. It is AA sectional drawing in FIG. It is BB sectional drawing in FIG. It is a block diagram of another processing system of the exhaust gas after heat recovery with a boiler.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fine carbide combustion apparatus 1b Gas combustion apparatus 2 Air nozzle 2a, 2b, 2c, 2d Air nozzle 3, 4 Low oxygen gas injection nozzle 3a, 3b, 3c, 3d Low oxygen gas injection nozzle 5 Ammonia injection nozzle 6 Burner mounting seat 7 Ash extraction outlet 8 Gas outlet 9 Viewing window 20 First virtual circle 30 Second virtual circle 104 Carbonization furnace 106 Boiler 112 Power generation equipment 121 High-temperature combustion gas 123 Carbide

Claims (10)

A waste system having a combustion region for burning waste-based fine carbide, a burner for injecting and burning fine-particle carbide of waste-based material into the furnace, and providing the burner at the furnace inlet In the pulverized carbide combustion device of the material,
First swirl flow forming means for forming a swirl flow of air by blowing air into the furnace downstream of the burner along the flow direction of the combustion gas in the furnace is provided, and the first swirl flow forming means A gas supply means for forming a swirling flow or a counter flow of the low oxygen gas by blowing low oxygen gas into the furnace on the downstream side is provided,
When forming the swirl flow by the gas supply means, the swirl flow area of the air formed by the first swirl flow formation means is larger than the swirl flow area of the low oxygen gas formed by the gas supply means. A waste-based fine carbide combustion apparatus characterized by that.   The gas supply means is provided in multiple stages in the flow direction of the combustion gas in the furnace, and the swirling flow or counter flow of the low oxygen gas formed by the gas supply means is multistage. Waste-based fine carbide combustion equipment.   The first swirl flow forming means blows the air in a tangential direction of a first virtual circle in a plane orthogonal to the flow direction of the combustion gas in the furnace, and the air along the first virtual circle The waste-based fine carbide combustion apparatus according to claim 1 or 2, wherein a swirl flow is formed.   When the swirl flow is formed by the gas supply means, the low oxygen gas is blown in a tangential direction of a second virtual circle in a plane orthogonal to the flow direction of the combustion gas in the furnace, and the second virtual circle 4. The waste-based fine carbide combustion apparatus according to claim 1, wherein a swirl flow of low oxygen gas is formed along the vertical direction.   The waste-based fine carbide combustion apparatus according to any one of claims 1 to 4, further comprising means for injecting urea or ammonia into the furnace downstream of the gas supply means in the flow direction of the combustion gas. . In a waste-based fine carbide combustion method in which a waste-based fine carbide is jetted and burned by a burner provided at the furnace inlet to a furnace having a combustion region for burning waste-based fine carbide.
While blowing air so as to form a swirling flow of air downstream of the burner in the combustion gas flow direction in the furnace,
Low oxygen gas is blown into the combustion gas flow direction downstream side of the air swirl flow so as to form a swirl flow or counter flow of the low oxygen gas,
A waste-based fine carbide combustion method characterized in that, when the low oxygen gas is blown so as to form a swirl flow, the swirl flow area of the air is made larger than the swirl flow area of the low oxygen gas.   The waste-based pulverized carbide combustion method according to claim 6, wherein the low oxygen gas is blown in multiple stages in the flow direction of the combustion gas, and the swirling flow or counter flow of the low oxygen gas is made into multiple stages.   The air is blown in a tangential direction of a first imaginary circle in a plane perpendicular to the flow direction of the combustion gas, and a swirling flow of air along the first imaginary circle is formed in the furnace. A waste-based fine carbide combustion method according to claim 6 or 7.   When the low oxygen gas is blown so as to form a swirling flow, the low oxygen gas is blown in a tangential direction of a second virtual circle in a plane perpendicular to the flow direction of the combustion gas, and the second oxygen gas is injected into the furnace. The waste-based fine carbide combustion method according to any one of claims 6 to 8, wherein a swirling flow of low oxygen gas along two virtual circles is formed.   10. The waste-based fine carbide combustion method according to claim 6, wherein urea or ammonia is blown into the downstream side in the flow direction of the combustion gas from the swirling flow or counterflow of the low oxygen gas.

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