JP2003294205A - Coal burning boiler, organic waste gasification furnace, and coal ash treatment plant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coal burning boiler which generates a combustible gas from an organic waste such as plastic, and uses the generated combustible gas as a fuel for the coal burning boiler, and also to provided an organic waste gasification furnace and a coal ash treating plant for fusion-treating coal ash generated from a combustion part of the coal burning boiler and from an economizer thereof by the gasification furnace for forming gasification. <P>SOLUTION: There are provided the coal burning boiler, organic waste gasification furnace and coal ash treating plant. The coal ash generated in the coal burning boiler is supplied to a fusion area inside the gasification furnace, in the gasification furnace for fusion-treating the organic waste such as plastic, so as to treat continuously the coal ash with high efficiency. The combustible gas rich in carbon monoxide and hydrogen generated in the gasification furnace is supplied into the coal burning boiler at the same time and burned mixedly as fuel to use effectively the gas generated in the gasification furnace. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a novel coal-fired boiler, an organic waste gasification furnace, and a coal ash treatment plant, and in particular, melts coal ash produced from a coal-fired boiler, and waste plastics and the like. The present invention relates to a coal-fired boiler for supplying coal ash to a gasification furnace for thermally decomposing and partially oxidizing organic waste with an oxidizing agent such as oxygen to process the same, a gasification furnace for organic waste, and a coal ash treatment plant.

[0002]

2. Description of the Related Art It is expected that the amount of combustion ash emitted will increase with the recent expansion and construction of coal-fired power plants, and the treatment of the combustion ash discharged from coal-fired power plants has become a major issue.

Typical methods of treating combustion ash discharged from conventional coal-fired boilers are roughly classified into landfill and effective reuse. When landfilling, it is difficult to secure a disposal site for combustion ash because the elution water of combustion ash is highly alkaline. Therefore, effective reuse is desired.

[0004] The effective use thereof is the cement field,
It is roughly divided into the field of civil engineering, the field of construction, the field of agriculture, forestry and fisheries,
Most of this is reuse in the cement sector.
In the cement field, it is currently used for cement raw materials, cement admixtures and concrete admixtures. Furthermore, in order to expand the utilization of coal ash, it is necessary to expand to the fields of. However, in order to use it as a raw material for cement, it is necessary to reduce the unburned content in ash as much as possible. The combustion ash discharged from the pulverized coal boiler contains 3 to 5% of unburned matter. This value depends on the type of coal, and coal that has a high fuel ratio and is difficult to burn produces a large amount of unburned matter. Stone burning with a carbon content of 5.0% or more had to be pretreated in a coal ash reforming furnace or the like. The regulation value of carbon content used for cement raw materials is 5.0% or less. The following is a typical example of continuously treating combustion ash generated from a coal-fired boiler.

Japanese Unexamined Patent Publication (Kokai) No. 62-125891 discloses a first method for separating and collecting fly ash from gas produced by combustion of coal.
Fly ash collecting means of, and a slag tap type combustion furnace into which the fly ash and oxygen-enriched air collected by this means are introduced.
The means for taking out the molten slag generated by the oxygen-enriched combustion of fly ash in the combustion furnace from the combustion furnace and the second fly ash means for collecting the fly ash with a low unburned carbon content from the produced gas There is shown a method for treating fly ash, which comprises means for taking it out or returning it to the combustion furnace again.

In JP-A-7-145924, when treating coal ash generated from a pulverized coal cooking boiler, pulverized coal is adjusted so that the unburned carbon concentration in the coal ash is 5 to 20% in the boiler. The coal ash in which the unburned carbon content remains, is introduced into a melting furnace, and the coal ash is combusted and melted with oxygen or an oxygen-rich gas, and high-temperature combustion exhaust gas discharged from the melting furnace is discharged. A method for treating coal ash returned to the boiler is shown.

In Japanese Patent Laid-Open No. 2001-153309, in a pulverized coal boiler having an ash melting furnace for producing high-temperature combustion gas and a plurality of stages of burners, coal ash recovered by a dust collector is supplied to the ash melting furnace. Is provided with an outlet pipe for the exhaust gas of the ash melting furnace at the lower stage of the bottom burner of the pulverized coal boiler, and the exhaust gas and fly ash from the ash melting furnace are also supplied to the pulverized coal boiler at the same time. And a method for treating coal ash using an ash melting furnace is shown.

[0008]

[Patent Document 1] Japanese Patent Application Laid-Open No. 62-125891 discloses that a fly ash having unburned carbon is burned in a slag tap type combustion furnace to reduce unburned carbon in the fly ash. No treatment of coal ash formed at the bottom is given, nor is treatment of organic waste given.

In JP-A-7-145924, in a boiler, pulverized coal is burned so that the unburned carbon concentration in coal ash is 5 to 20%, and bottom ash taken out from the bottom of the boiler and combustion exhaust gas. Combustion of fly ash with unburned carbon recovered from the combustion unit provided above the melting furnace to reduce unburned carbon in the bottom ash and fly ash and to melt those coal ash. However, the relationship between the treatment of organic waste and the treatment of coal ash by it is not shown.

In Japanese Unexamined Patent Publication No. 2001-153309, fly ash containing unburned carbon is burned in an ash melting furnace to reduce unburned carbon in the fly ash and to further reduce NOx emissions. It supplies high-temperature combustion gas discharged from the melting furnace to the bottom of the boiler, but does not show treatment of coal ash formed at the bottom of the boiler, nor treatment of organic waste.

An object of the present invention is to provide a coal-fired boiler which can produce organic waste such as plastic into a combustible gas and can use the produced combustible gas as a fuel for a coal-fired boiler. It is in.

Further, an object of the present invention is to produce an organic waste such as plastic into a combustible gas, which is produced from a combustion section of a coal-fired boiler and its economizer by a gasification furnace which forms the gasification thereof. An object of the present invention is to provide an organic waste gasification furnace and a coal ash processing plant capable of melting and processing coal ash.

[0013]

A coal-fired boiler according to the present invention has the following constitution. Combustion part for burning coal, primary heat exchange part provided with superheater tube on the upper part of the combustion part, secondary heat exchange part provided with economizer downstream of the heat exchange part, and organic waste And a supply means for supplying a combustible gas generated from a gasification furnace for gasifying

A combustion part for burning coal, a primary heat exchange part provided with a superheater tube above the combustion part, a secondary heat exchange part provided with a economizer downstream of the heat exchange part, and Boiler combustion section coal ash supply device that supplies the coal ash recovered from the cooling tower to a cooling tower that cools the coal ash generated in the combustion section and a gasification furnace that gasifies organic waste into combustible gas And a coal ash removing device that removes coal ash from the gas that exits the economizer, and a coal ash supply device that supplies the coal ash recovered by the coal ash removing device to the gasification furnace,
Further, it has a supply means for supplying the combustible gas to the combustion section.

The organic waste gasification furnace of the present invention has the following constitution. A gasification chamber for gasifying the organic waste into a flammable gas, and a heat recovery boiler provided in the upper part of the gasification chamber for recovering heat generated in the gasification chamber,
It has a distribution pipe which connects the above-mentioned coal cooking boiler and a heat recovery boiler which supply the generated gas generated in the above-mentioned gasification chamber as fuel to a coal cooking boiler.

[0016] As described above, the char and toxic components in the combustible gas generated from the coal ash supply nozzle for supplying the coal ash produced in the coal-fired boiler to the gasification chamber and the gasification furnace are removed, and It has at least one of the removal devices connected to the flow pipe.

A cylindrical gasification chamber for gasifying the organic waste into a combustible gas, and the organic waste and the oxidizer are arranged so as to form a swirling flow along the circumferential direction in the gasification chamber. An organic waste supply nozzle, a slag cooling chamber provided in the lower part of the gasification chamber for cooling the ash melted in the gasification chamber, and a heat recovery boiler for recovering the heat generated in the gasification chamber And a coal ash supply nozzle provided below the gasification chamber to supply the coal ash generated in the coal-fired boiler so as to form a swirl flow in the gasification chamber along the circumferential direction.

As described above, a distribution pipe connecting the coal burning boiler for supplying the combustible gas as a fuel to the coal burning boiler and the gasification furnace, a char in the combustible gas generated from the gasification furnace, and And a removing device for removing harmful components and connected to the flow pipe.

It is preferable that the organic waste supply nozzle and the coal ash supply nozzle are provided with an oxidizer supply nozzle for supplying an oxidizer on the outer circumference of each nozzle.

A plurality of oxidant supply nozzles for supplying an oxidant are arranged in the gasification chamber so as to form a swirl flow in the circumferential direction of the gasification chamber, and the oxidant supply nozzles are used for the organic waste. It is preferably provided above the supply nozzle and the coal ash supply nozzle.

The diameter of the swirling flow formed by the oxidant supply nozzle is preferably arranged to be larger than the diameter of the swirling flow formed by the organic waste supply nozzle and the coal ash supply nozzle. .

The coal ash processing plant of the present invention has the following constitution. A coal-fired boiler, a gasification furnace for gasifying organic waste into combustible gas, a supply means for supplying the coal ash generated in the boiler to the gasification furnace, and a gasification furnace And a supply means for supplying the generated gas as fuel to the combustion section of the boiler,
The coal ash is melt-processed in the gasification furnace.

A coal ash treatment plant having a coal-fired boiler and a gasification furnace for gasifying organic waste into combustible gas, and melting and processing the coal ash produced in the boiler by the gasification furnace. The coal-fired boiler and the gasification furnace include the coal-fired boiler and the organic waste gasification furnace described above.

As described above, the present invention gasifies an organic waste such as plastic into a combustible gas, and at the same time, the ash produced is melted at the same time as the coal ash produced from the coal-fired boiler. Along with processing, the organic waste is gasified, and the combustible gas rich in carbon monoxide and hydrogen that is generated is supplied to the coal-cooking boiler and co-firing as fuel to achieve effective use of energy. At the same time
The efficiency of continuous processing of coal ash can be improved.

In particular, the gasification furnace for gasifying the organic waste in the present invention has one chamber, and the upper and lower two gasification furnaces are provided in the furnace.
By forming a swirling flow in the stage, the residence time of the particles is extended, and by simultaneously filling pyrolysis and partial oxidation in one furnace, it is possible to obtain a combustible gas containing carbon monoxide and hydrogen as main components. It was used.

[0026]

FIG. 1 is a system diagram showing the configuration of an ash treatment system using organic waste and coal combustion according to the present invention. As shown in FIG. 1, an organic waste 3 and an oxidant are supplied to a coal-fired boiler 21 in a gasification furnace 9, and hydrogen and carbon monoxide are generated by a thermal decomposition reaction and a partial oxidation reaction of the organic waste 5. A gasification furnace 1 (a heat recovery boiler is laid on the upper part of the gasification furnace reaction section) for obtaining gas as a main component, and a removal device 35 for removing harmful substances such as char and chlorine in the produced gas at the exit of the gasification furnace ( (A dust collector, a refining device is included), the gasification furnace 9, the distribution pipe 16 which connects the combustion part 34 of the coal cooking boiler 21, and the coal combustion boiler which supplies the coal ash generated from the coal cooking boiler 21 to the gasification furnace 9. Gasification furnace 9 from ash supply device 22 and coal ash supply device 25 through coal ash supply nozzle 28
Is supplied to.

Nozzles 28, 2 for supplying the organic waste 5, the bottom ash 23 produced from the coal burning and combusting section 34, and the fly ash 26 scattered and recovered from the boiler to the lower part of the gasification furnace 9.
A nozzle 30 having 8 '(both of which ejects the oxidizer 6) and supplying the oxidizer 6 alone is installed. When the oxidizer is supplied into the gasification furnace 9 at the same time that the organic waste 5 is supplied, a swirl flow 31 is formed in the gasification chamber 11 ′. The organic waste 5 is added to the lower part of the organic waste supply device 3
When the gas is fed into the gasification furnace 9 by means of gravity, it falls due to gravity, and a part of the organic waste 5 is thermally decomposed to generate a hydrocarbon gas of carbon 2 or more. The generated heat raises the temperature to melt the ash in the organic waste 5. The bottom ash 23 discharged from the bottom of the coal-fired boiler combustion section and the fly ash 26 scattered and collected from the boiler 21 are conveyed to the high-temperature zone by the supply devices 22 and 25, and the ash supply nozzles 28 and 28 'installed in the lower section. Supplied via. Molten ash is discharged from the bottom of the gasification furnace.

The hydrocarbon gas having carbon chains of 2 or more produced by thermal decomposition rises to the upper part of the gasifier, and when the oxidant 32 is swirl-supplied from the oxidant nozzle 12 installed in the upper part to react with the oxidant. , Lightened to produce carbon monoxide and hydrogen. However, when the organic waste 5 is gasified, a minute amount of harmful substances such as chlorine is generated. Therefore, a purification device for removing the harmful substances is installed and a char containing unburned carbon is contained in the produced gas. Since it contains it, we installed a dust collector to remove it and made it a clean gas. This gas is circulated from the distribution pipe to the coal-burning boiler combustion section 34 and used as fuel.

The system of FIG. 1 is roughly divided into a gasifier 9 for organic waste gasification, a removal device (including a dust collector and a refiner) 35 an organic waste gasifier 9 to a coal-fired boiler flow pipe 16, coal-fired boiler 21, coal-fired boiler combustion section bottom ash supply device 22, dust collector (cyclone,
24) and a fly ash feeder 25.

The gasification furnace 9 comprises a molten slag cooling section 14, a gasification reaction section 11 and a heat recovery boiler 10. The gasification reaction section 11 is a spouted bed type gasification furnace in which an oxidizer and the organic waste 5 are contacted and gasified in an air stream. This feature is
By adopting the one-chamber two-stage gasification system and branching the raw material and the oxidizer into upper and lower stages to form a swirling flow, the residence time of gas + raw material becomes longer, and the gasification efficiency can be improved. The organic waste 5 in the organic waste filling container 1 is supplied to the lower part from the supply line 4 through the organic waste supply device 3 (mechanical means, etc.) into the lower part 11 'of the gasification reactor reaction section. Then, it falls due to gravity and some organic waste 5
Is pyrolyzed to generate a hydrocarbon gas having 2 or more carbons. The generated heat raises the temperature to melt the ash in the organic waste 5. The bottom ash 23 discharged from the bottom of the coal-fired boiler combustion section is discharged to the high temperature zone from the boiler combustion section coal ash supply device 22 and the fly ash 26 scattered and collected from the boiler 21 by the coal ash supply apparatus 22 to be inactive. The gas (nitrogen, carbon dioxide, etc.) 36, 36 'was carried by air flow, and was supplied through the coal ash supply nozzles 28, 28' shown in FIG. 2 installed in the lower part 11 'of the gasification reaction section. The coal ash supply nozzles 28, 28 'are water cooling type in which water is circulated to the outer wall.

As shown in FIG. 2, the bottom ash 23 discharged from the bottom of the boiler passes through the boiler combustion section coal ash supply device 22 and is scattered and recovered from the coal ash supply nozzle 28 'to the gasification furnace 9 and from the boiler 21. The fly ash 26 is a coal ash supply device 25
And is supplied to the gasification furnace 9 from the coal ash supply nozzle 28. Further, oxygen is supplied to each nozzle through an oxygen supply line provided on the outer circumference thereof. or,
To the coal ash supply portion, the organic waste 5 and the oxygen supplied from the oxygen supply line provided on the outer periphery of the organic waste 5 are supplied to the gasification furnace 9, and the oxidant nozzle 30 supplies the oxygen.
Both supplies are supplied so as to form a swirl flow.

FIG. 3 is a sectional view of the oxidant nozzle 12 for supplying oxygen to the gasification furnace 9. 4 oxidizer nozzles 12
They are evenly arranged on the outer periphery of the gasification furnace 9, and are arranged so that a swirl flow is formed in each case. The diameter of this swirling flow is larger than the diameter of the swirling flow formed by the coal ash supply nozzle, and a two-stage swirling flow is formed.

As described above, the gasification furnace 9 in this embodiment is
Is to form a swirl flow in the upper and lower stages of the furnace in one chamber, thereby extending the residence time of the coal ash and the organic waste particles, and performing pyrolysis and partial oxidation in one furnace. It is utilized that the fuel gas containing carbon monoxide and hydrogen as main components is obtained by simultaneously filling.

Since the lower region has a high temperature of 1600 ° C. or higher, the ash and the coal ash in the organic waste 5 are melted and the slag 13 is produced. The slag 13 was allowed to fall freely into the cooling section 14 in which water was filled in the lower part of the lower part 11 ′ of the gasification reaction section, and was rapidly cooled and solidified.

The oxidant (oxygen) has an oxidant filling container 6, an upper stage oxygen supply line 32, an upper stage oxygen supply amount control valve 7, a lower stage oxygen supply line 29, and a lower stage oxygen supply amount control valve 8. The supply amount of the oxidizing agent in the upper and lower stages was set according to the temperatures of the upper and lower stages. The temperature control of the upper and lower parts is adjusted by the ratio of the oxygen supply amount and the organic waste 5 supply amount.

The hydrocarbon gas having two or more carbon chains produced by thermal decomposition rises to the upper part of the gasification furnace, and the oxidant 32 is swirl-supplied from the oxidant nozzle 12 installed in the upper stage 11 "to generate the oxidant. When it is reacted, it is oxidised to generate carbon monoxide and hydrogen, and the gas generated from the gasification reaction section 11 recovers the heat of the high temperature gas by the heat recovery boiler 10.
Further, at the outlet of the gasification furnace 9, a removing device 35 for removing harmful substances in the produced gas (since the produced gas contains a small amount of harmful substances such as chlorine, a purification device and an unreacted device for removing the harmful substances). The char containing carbon in the fuel contains a few% of the char. Therefore, a charcoal-burning boiler combustor 34 is installed after a charcoal-burning boiler is installed.
Supplied to.

The clean gas rich in carbon monoxide and hydrogen is supplied from the gasification furnace 9 through the coal-fired boiler flow pipe 16 to the coal-fired boiler combustion section 34, where it is mixed and burned as fuel. The produced gas generated from the gasification furnace 9 contains little nitrogen oxide. However, the raw material containing a large amount of nitrogen in the organic waste 5 has a slightly larger content of nitrogen oxides. Coal and air are supplied to the coal cooking boiler 21 from the coal supply nozzle 18, and although not shown, primary, secondary and tertiary superheat pipes and reheat pipes are sequentially arranged on the downstream side in the boiler main body. A reheat pipe, a heater, an evaporator and a economizer are sequentially arranged in the auxiliary section.

Bottom ash feeder 2 for burning coal-fired boiler
2 and the fly ash supply device 25 quantitatively discharge by a mechanical means such as a rotary feeder, and then carry by air flow with an inert gas (nitrogen, carbon dioxide, etc.), and the gasification furnace reaction part 11 ′.
Supply in. Details of the coal-fired boiler combustion section bottom ash supply device 22 and the fly ash supply device 25 will be described with reference to FIG. 1.

Under the combustion furnace 34, cooling towers 38 and 40 filled with water for cooling ash were installed, and the ash at about 800 ° C. was once cooled and then discharged into an ash recovery container 42. Then, while blowing out the drying air of about 200 ° C., the belt conveyor 51 supplies it to the coal-fired boiler combustion section bottom ash feeder 22 having the crusher 43, and feeds the crushed ash with the screw feeder 45. At the same time, the carrier gas (or inert gas) 36 was supplied from the ash supply line 23 to the gasification reaction section 11 ′ through the coal ash supply nozzle 28 ′.
Since the ash contains a lump of 40 mm or more, if it is supplied to the transport line in this state, it may be clogged. Therefore, the ash was crushed to 0.15 mm or less and then discharged by the screw feeder 45 in a fixed amount.

The fly ash supply system comprises a dust collector 24, a dust collecting and recovery hopper 46, a valve 48, and a fly ash feeder 25. The fly ash supply device 25 includes a hopper 47, a screw feeder 50, a carrier gas (or inert gas) 36 ′, and a fly ash supply line 26. Since the fly ash is around 200 ° C., the above devices are heated to around 150 ° C. so that the fly ash supply system does not lower the temperature and condense. The fly ash is collected by the dust collector 24, filled in the dust collecting hopper 46, then supplied to the fly ash feeder 25, and discharged in a fixed amount using the screw feeder 50. The fly ash discharged is supplied to the coal ash supply line 2 with the carrier gas 36 '.
6 through the coal ash nozzle 28, the gasification reaction section 11 ′
Supply to.

As described above, the coal ash generated from the coal-fired boiler is simultaneously melt-processed in the gasification furnace that melts and processes the organic waste such as plastic, and the combustible gas is generated from the organic waste. Gasification process, and the resulting combustible gas rich in carbon monoxide and hydrogen is fed into the coal-fired boiler and co-firing as fuel, which enables effective use of energy and at the same time continuous treatment of coal ash. High efficiency can be achieved.

[0042]

According to the present invention, coal ash generated from a coal-fired boiler is simultaneously melted in a gasification furnace for melting and processing organic waste such as plastics, and the organic waste is converted into combustible gas. By gasifying and supplying combustible gas rich in carbon monoxide and hydrogen into a coal-fired boiler and co-firing it as fuel, it is possible to use energy effectively and at the same time, continuously process coal ash. The efficiency of can be improved. In addition, after the organic waste is gasified and passed through a dust collector and a purification device that removes dust and harmful substances such as chlorine in the combustible gas, the produced gas rich in carbon monoxide and hydrogen is cooked with coal. The energy of the combustible gas generated from the gasification furnace can be effectively used by supplying it into the boiler and cofiring it as fuel.

[Brief description of drawings]

FIG. 1 is a system diagram showing the configuration of an ash treatment system by burning organic waste and coal according to the present invention.

FIG. 2 is a cross-sectional view of a coal ash supply nozzle in a lower stage portion of the gasification furnace of the present invention.

FIG. 3 is a cross-sectional view of an oxidizer nozzle in an upper stage portion in the gasification furnace of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Organic waste filling container, 2 ... Nitrogen gas for pressurization and conveyance, 3 ... Organic waste supply device (mechanical means, etc.), 4
... Supply line, 5 ... Organic waste, 6 ... Oxidizer filling container, 7 ... Upper oxygen flow rate control valve, 8 ... Lower oxygen flow rate control valve, 9 ... Gasification furnace, 10 ... Heat recovery boiler, 11 ... Gasification Reaction part, 11 '... Gasification reaction part lower part, 11 "... Gasification reaction part upper part, 12 ... Oxidizing agent nozzle, 13 ... Molten slag, 14 ... Molten slag cooling part (water filling), 15 ... Slag hopper, 16 … Gasifier to boiler combustion flow pipe, 17
… Air for burning coal, 18… Coal supply nozzle, 19…
Coal supply unit, 20 ... Coal supply line, 21 ... Coal cooking boiler, 22 ... Coal cooking boiler combustion unit ash supply device, 23 ...
Coal-fired boiler combustion section ash supply line, 24 ... Dust collector (cyclone, bag filter, etc.), 25 ... Coal ash supply device, 26 ... Coal ash supply line, 27 ... To refining device 2
8, 28 '... Coal ash supply nozzle, 29 ... Lower oxygen supply line, 30 ... Oxidizer nozzle, 31 ... Lower swirl flow, 32 ...
Upper stage oxygen supply line, 33 ... Upper stage swirling flow, 34 ... Coal-fired boiler combustion section, 35 ... Removal device, 36, 36 '... Inert gas (nitrogen, carbon dioxide, etc.), 37 ... Switching valve, 38 ... Cooling tower, 39 ... Switching valve, 40 ... Cooling tower, 41 ... Switching valve, 42 ... Ash collection container, 43 ...
Crusher, 44 ... Gas for adjusting hopper pressure (or inert gas), 45 ... Screw feeder, 46 ... Dust collecting hopper,
47 ... Hopper, 48 ... Switching valve, 49 ... Hopper pressurizing gas (or inert gas), 50 ... Screw feeder, 51 ... Belt conveyor.

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) C10J 3/00 C10J 3/00 FJ L F23G 5/027 Z F23G 5/027 5/46 B 5/46 B09B 3 / 00 303L (72) Inventor Jun Morihara 7-2-1, Omika-cho, Hitachi-shi, Ibaraki Hitachi Electric Co., Ltd. Electric Power and Electrical Development Laboratory (72) Inventor Toru Aiyama 7-2-1 Omika-cho, Hitachi-shi, Ibaraki Fukuhiko Kiso (72) Inventor, Hitachi, Ltd. Electricity and Electric Power Development Laboratory (72) Fumihiko Kiso 7-2-1, Omika-cho, Hitachi City, Hitachi, Ibaraki (72) Inventor Fumihiko Hanayama Hiroshima 6-9 Takaracho, Kure-shi, Kyushu B-cock Hitachi F-term in Kure Works (reference) 3K046 AA01 AB02 AC06 BA01 BA07 BA09 CA08 DA00 EA01 EA03 FA06 3K061 AA16 AB02 AB03 AC13 BA05 CA07 3K065 AA16 AB02 AB03 AC13 BA05 JA04 JA18 4D004 AA07 A36 AA AA37 BA03 CA27 CA29 CB34

Claims (15)

[Claims] 1. A combustion section for burning coal, a primary heat exchange section provided with a superheater tube above the combustion section, and a secondary heat exchange section provided with a economizer downstream of the heat exchange section. A coal-fired boiler, comprising: a supply unit configured to supply a combustible gas generated from a gasification furnace that gasifies organic waste to the combustion unit. 2. A combustion section for burning coal, a primary heat exchange section provided with a superheater tube above the combustion section, and a secondary heat exchange section provided with a economizer downstream of the heat exchange section. A boiler combustion section coal ash that supplies the coal ash recovered from the cooling tower to a cooling tower that cools the coal ash generated in the combustion section and a gasification furnace that gasifies organic waste into combustible gas A supply device, a coal ash removal device that removes coal ash from the gas that has exited the boiler economizer, and a coal ash supply device that supplies the coal ash recovered by the coal ash removal device to the gasification furnace. A coal-fired boiler characterized by having. 3. A combustion section for burning coal, a primary heat exchange section provided with a superheater tube above the combustion section, and a secondary heat exchange section provided with a economizer downstream of the heat exchange section. A cooling tower provided at the bottom of the combustion section for cooling the coal ash generated in the combustion section, and the coal ash recovered from the cooling tower in a gasification furnace for gasifying organic waste into combustible gas Boiler combustion unit coal ash supply device for supplying, coal ash removal device for removing coal ash from the combustion gas exiting the economizer, coal ash recovered by the coal ash removal device to the gasification furnace A coal-fired boiler, comprising: a coal ash supply device that supplies the combustible gas to the combustion section. 4. A gasification chamber for gasifying organic waste into a flammable gas, a heat recovery boiler provided above the gasification chamber for recovering heat generated in the gasification chamber, and the gas. An organic waste gasification furnace comprising: a distribution pipe that connects the coal-burning boiler and the heat recovery boiler, which supplies the generated gas generated in the gasification chamber to the coal-burning boiler as fuel. 5. A gasification chamber for gasifying organic waste into a flammable gas, a heat recovery boiler provided above the gasification chamber for recovering heat generated in the gasification chamber, and the gasification. A distribution pipe that connects the coal cooking boiler and the heat recovery boiler that supply the generated gas generated in the chamber as a fuel to the coal cooking boiler, and the coal ash supply that supplies the coal ash generated in the coal cooking boiler to the gasification chamber An organic waste gasification furnace having a nozzle. 6. A gasification chamber for gasifying organic waste into a combustible gas, a heat recovery boiler provided above the gasification chamber for recovering heat generated in the gasification chamber, and the gasification. Remove the char and harmful components in the combustible gas generated from the gasification furnace, and a distribution pipe that connects the coal-burning boiler and the heat recovery boiler that supply the generated gas generated in the chamber as fuel to the coal-burning boiler. An organic waste gasification furnace, comprising: a removal device connected to the flow pipe. 7. A cylindrical gasification chamber for gasifying an organic waste into a combustible gas, and the organic waste and the oxidant form a swirling flow along the circumferential direction in the gasification chamber. An organic waste supply nozzle arranged, a slag cooling chamber provided at the bottom of the gasification chamber for cooling the ash melted in the gasification chamber, and a heat recovery for recovering heat generated in the gasification chamber It has a boiler and a coal ash supply nozzle which is provided in the lower part of the gasification chamber and supplies the coal ash generated in the coal-fired boiler so as to form a swirling flow along the circumferential direction in the gasification chamber. And an organic waste gasifier. 8. A cylindrical gasification chamber for gasifying an organic waste into a combustible gas, and the organic waste and the oxidant form a swirling flow in the gasification chamber along the circumferential direction. , An organic waste supply nozzle disposed in the gasification chamber, a slag cooling chamber provided under the gasification chamber for cooling the ash melted in the gasification chamber, and heat for recovering heat generated in the gasification chamber. A recovery boiler, a coal ash supply nozzle that is provided in the lower part of the gasification chamber, supplies coal ash generated in the coal-fired boiler so as to form a swirl flow in the gasification chamber along the circumferential direction, and the flammability A distribution pipe connecting the coal-fired boiler and the gasifier to supply gas to the coal-fired boiler as fuel,
An organic waste gasification furnace, comprising: a removal device for removing chars and harmful components in the combustible gas generated from the gasification furnace and connected to the flow pipe. 9. The oxidant supply nozzle according to claim 4, wherein the organic waste supply nozzle and the coal ash supply nozzle are each provided with an oxidant supply nozzle for supplying an oxidant. Organic waste gasifier. 10. The gasification chamber according to claim 4, wherein a plurality of oxidant supply nozzles for supplying an oxidant are arranged so as to form a swirl flow in the circumferential direction of the gasification chamber. The organic waste gasification furnace, wherein the oxidant supply nozzle is provided above the organic waste supply nozzle and the coal ash supply nozzle. 11. The diameter of the swirl flow formed by the oxidant supply nozzle is greater than the diameter of the swirl flow formed by the organic waste supply nozzle and the coal ash supply nozzle. The organic waste gasification furnace is also characterized in that it is arranged so as to become larger. 12. A coal-fired boiler, a gasification furnace for gasifying organic waste into combustible gas, a supply means for supplying the coal ash generated in the boiler to the gasification furnace, and the gas. A coal ash processing plant comprising: a supply unit configured to supply, as a fuel, a generated gas generated by a gasification furnace to a combustion section of the boiler, and melting the coal ash in the gasification furnace. 13. A coal ash that has a coal-fired boiler and a gasification furnace that gasifies organic waste into combustible gas, and melts the coal ash produced in the boiler by the gasification furnace. It is a processing plant, Comprising: The said coal cooking boiler consists of the coal cooking boiler in any one of Claims 1-3, The coal ash processing plant characterized by the above-mentioned. 14. A coal ash that has a coal-fired boiler and a gasification furnace that gasifies organic waste into combustible gas, and that melts the coal ash produced in the boiler by the gasification furnace. A processing plant, wherein said gasification furnace is
12. A coal ash processing plant comprising the organic waste gasification furnace according to any one of 1 to 11. 15. A coal ash that has a coal-fired boiler and a gasification furnace that gasifies organic waste into combustible gas, and melt-processes the coal ash produced in the boiler by the gasification furnace. It is a processing plant, Comprising: The said coal cooking boiler consists of the coal cooking boiler in any one of Claims 1-3,
A coal ash processing plant, wherein the gasification furnace comprises the organic waste gasification furnace according to any one of claims 4 to 11.