JP2002310402A - Utilizing facility for gas produced by gasifying melting furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a utilizing facility for gas produced by a gasifying melting furnace capable of effecting highly efficient power generation without increasing a running cost and an equipment expense even when steam in a superheater is increased in temperature and pressure. SOLUTION: The utilizing facility comprises a waste heat boiler in which produced gas produced in the gasifying melting furnace is introduced; exhaust gas treating equipment for removing a corrosion component from the produced gas discharged from the waste heat boiler; and a gas fired boiler for burning the produced gas treated in the exhaust gas treating equipment and effect collection of superheated steam.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a facility for utilizing a product gas generated in a gasification and melting furnace in a gasification and melting system.

[0002]

2. Description of the Related Art Recently, incineration of municipal garbage, sewage sludge, human waste sludge, combustible industrial waste, etc. (hereinafter, simply referred to as "waste"), as a system for melting ash and realizing high-efficiency power generation. Attention has been focused on a gasification and melting system that gasifies waste and generates electric power using generated gas and the like.

As one of the gasification and melting systems, there is a system using a shaft type gasification and melting furnace. The shaft-type gasification and melting furnace used here uses coke as an auxiliary fuel, pyrolyzes waste, gasifies it, and further melts incombustibles and combustion residues. The volume can be reduced, and the metals and incombustibles contained in the waste can be melted and recovered.
Further, steam is recovered from a high-temperature exhaust gas obtained by burning the generated gas by a waste heat boiler, and the recovered steam is supplied to a steam turbine to generate power.

FIG. 7 shows an example of a gasification and melting system using a conventional gasification and melting furnace.

[0005] In the gasification and melting furnace 1, auxiliary materials such as coke and limestone are charged together with waste, and a coke layer is formed at the bottom of the furnace. Then, air or oxygen-enriched air is blown into the coke layer to burn coke and the carbonized residue of waste, thereby forming a high-temperature combustion zone. The input waste forms a fluidized bed above the high-temperature coke bed, and is thermally decomposed and gasified while being preheated to generate combustible gas. A part of the generated combustible gas is burned in the gasification and melting furnace 1, and the rest is led out of the furnace as a high-temperature generated gas containing the combustible gas. On the other hand, the ash and incombustibles in the waste in the gasification and melting furnace 1 fall onto the high-temperature coke layer and melt, become molten slag, drop through the coke layer, accumulate at the furnace bottom and are discharged. You.

[0006] A high-temperature generated gas containing a combustible gas generated in the gasification and melting furnace 1 is introduced into a secondary combustion chamber 5 attached thereto and burned. The combustion exhaust gas discharged from the secondary combustion chamber 5 is introduced into the waste heat boiler 2 provided adjacent to the secondary combustion chamber 5. Steam from the evaporating pipes 10 d and 10 e provided in the secondary combustion chamber 5 and the waste heat boiler 2 is collected in the steam drum 9. The saturated steam collected in the steam drum 9 is sent to the superheater 7 provided in the waste heat boiler 2,
There, it is heated and becomes superheated steam. The superheated steam heated by the superheater 7 is sent to a power generation turbine 8 in a power generation facility attached to the waste heat boiler 2 to generate power. The exhaust gas discharged from the waste heat boiler 2 is sent to an exhaust gas treatment facility 3 provided adjacent to the waste heat boiler 2, and after the exhaust gas is rendered harmless, is discharged outside from the chimney 6.

[0007]

However, in the gasification and melting system according to the conventional example shown in FIG. 7, the power recovery amount is insufficient. This is because the recovered steam temperature is low, and it is important to increase the temperature and pressure of the steam in order to increase the power generation efficiency. However, in the conventional gasification and melting system, the temperature and pressure of steam generated by the superheater 7 in the waste heat boiler 2 cannot be as high as about 300 ° C. and about 30 kg / cm ² . There is a problem that power generation efficiency is lower than that of an industrial combustion boiler.

The waste contains salts such as NaCl, which reacts with SO ₂ , O ₂ , H ₂ O and the like in the combustion gas as shown in the following equation in the course of thermal decomposition and combustion to form sulfuric acid. salt,
HCl gas and Cl ₂ gas are generated.

2NaCl + SO ₂ + 1 / 2O ₂ + H ₂ O
→ Na ₂ SO ₄ + 2HCl 2HCl + 1 / 2O ₂ → Cl ₂ + H ₂ O On the other hand, alkali metals and heavy metals in the salts contained in the waste gasify and react with Cl ₂ or SO ₂ to react with the alkali metal chloride and sulfuric acid. Salt is produced.

[0010] Fly ash and condensed components from the combustion gas adhere to the superheater tube (hereinafter, this is referred to as "adhered ash"). Adhesive ash contains the above alkali metal chloride and sulfate, 450 ° C
At about the temperature, a molten salt (eutectic salt) is formed. Adhesion ash is Z
When a heavy metal such as n or Pb is contained, the melting point is further lowered.

The molten salt is highly corrosive, and the dissolution reaction of the superheater tube metal proceeds to cause corrosion damage.

As a countermeasure against such molten salt corrosion of the superheater tube, the superheated steam temperature is set to 400 ° C. or lower so that the surface temperature of the superheater tube becomes about 450 ° C. or less, which is the melting point of the eutectic salt of the attached ash.
It is operated at below ℃. Because of this, high temperature of steam,
High pressure is limited, and the power generation efficiency remains at about 20%.

[0013] When performing high-efficiency power generation by increasing the temperature and pressure of steam, the superheater tube must be replaced frequently or an expensive corrosion-resistant alloy material such as a high Ni-Cr-Mo material is used. Is required, and there is a problem that running cost and equipment cost increase.

The present invention solves these problems and provides a gasification and melting furnace gas that can generate electricity efficiently without increasing running costs and equipment costs even when the temperature of the steam in the superheater is increased to a higher temperature and pressure. The purpose is to provide facilities for use.

[0015]

The features of the present invention for solving such a problem are as follows.

A first aspect of the present invention is a waste heat boiler into which a product gas generated in a gasification and melting furnace is introduced, and an exhaust gas treatment facility for removing corrosive components from the product gas discharged from the waste heat boiler. And a gas-fired boiler for combusting the product gas treated by the exhaust gas treatment facility and recovering superheated steam.

[0017] In the facility utilizing the gas produced by the gasification and melting furnace having the above structure, the corrosive components contained in the produced gas in the exhaust gas treatment facility, that is, sulfur oxides such as HCl, Cl ₂ and SO ₂ ;
Because it is possible to obtain clean product gas from which fly ash has been removed and the causative substance of molten salt corrosion has been removed, when using a gas-fired boiler to burn the product gas and recover heat using a superheater, a higher temperature, higher pressure Steam can be used, and power generation efficiency can be improved.

According to a second aspect of the present invention, there is provided a facility for utilizing gas produced by a gasification and melting furnace, wherein a dust remover is provided in a gas flow path between the gasification and melting furnace and the waste heat boiler. .

In the facility for utilizing gas produced by the gasification and melting furnace having the above structure, fly ash is removed by a dust remover provided between the gasification and melting furnace and the waste heat boiler in addition to the structure of the first aspect of the present invention. Therefore, the substance causing the molten salt corrosion is more reliably removed, dust is prevented from adhering to the waste heat boiler, and the heat recovery efficiency can be improved.

According to a third aspect of the present invention, there is provided a facility for utilizing gas produced by a gasification and melting furnace, wherein a dust remover is provided in a gas flow path between the waste heat boiler and the exhaust gas treatment facility.

In the facility utilizing the gas produced by the gasification and melting furnace having the above construction, fly ash is removed by a dust remover provided between the waste heat boiler and the exhaust gas treatment facility in addition to the construction of the first aspect of the present invention. Therefore, the cause of molten salt corrosion is more reliably removed and the load on exhaust gas treatment equipment is reduced,
Operating costs can be reduced.

According to a fourth aspect of the present invention, there is provided the first to third aspects.
In any one of the above items, a gas storage facility for storing a generated gas is provided upstream of the gas-fired boiler.

[0023] In the facility for utilizing gas produced by the gasification and melting furnace having the above structure, in addition to the structure of any of the above-described inventions, a gas storage facility provided upstream of the gas-fired boiler may be provided. The amount of generated gas and the flammable gas component ratio,
That is, since the time variation of the retained calorific value is absorbed and leveled, the properties and amount of gas supplied to the gas-fired boiler can be stabilized. For this reason, the superheated steam condition is stabilized, so that the power generation efficiency can be further improved. In addition, it is easy to adjust the amount of combustion air supplied to the gas-fired boiler, and the N
Low oxygen operation for suppressing the amount of Ox is also facilitated.

The invention of claim 5 is the invention of claims 1 to 4.
In any one of the above, a desulfurization facility is provided downstream of the gas-fired boiler.

[0025] In the facility for utilizing gas produced by the gasification and melting furnace having the above configuration, in addition to the configuration of any one of the above-mentioned inventions, a desulfurization facility provided downstream of the gas-fired boiler is provided. Since sulfur oxides and dust in the exhaust gas from the gas-fired boiler are removed, the exhaust gas can be more reliably cleaned.

According to a sixth aspect of the present invention, there is provided a waste heat boiler into which a product gas generated in a gasification and melting furnace is introduced, and an exhaust gas treatment facility for removing corrosive components from the product gas discharged from the waste heat boiler. And a gas-fired boiler that burns the product gas processed by the exhaust gas treatment equipment; and steam from an evaporator tube provided in the gas-fired boiler and provided in the waste heat boiler and / or the gas-fired boiler. And a superheater for performing superheating of the gasification and melting furnace.

In the facility for utilizing the gas produced by the gasification and melting furnace having the above structure, the corrosive components contained in the produced gas in the exhaust gas treatment facility, that is, sulfur oxides such as HCl, Cl ₂ and SO ₂ ,
Because it is possible to obtain clean product gas from which fly ash has been removed and the causative substance of molten salt corrosion has been removed, when using a gas-fired boiler to burn the product gas and recover heat using a superheater, a higher temperature, higher pressure Steam can be used, and power generation efficiency can be improved.

[0028] The invention of claim 7 is the first to sixth aspects of the present invention.
In any one of the above, a steam pipe provided in the waste heat boiler and configured to superheat steam from the evaporation pipe provided in the waste heat boiler, and constituting a superheater in the waste heat boiler Is covered with a cover material made of a ceramic alloy composite material.

In the facility for utilizing gas produced by the gasification and melting furnace having the above structure, a superheater provided in a waste heat boiler is constructed in addition to the structure of any one of the above-mentioned inventions. Since the steam pipe is covered with a cover material made of a ceramic alloy composite material, even if the temperature of the superheated steam in the waste heat boiler is raised to a high temperature and pressure, corrosion due to corrosive components contained in the generated gas can be prevented, so that power generation efficiency can be improved. Can be improved.

The invention according to claim 8 is directed to a waste heat boiler into which the generated gas generated in the gasification and melting furnace is introduced, and a waste heat boiler provided in the waste heat boiler and an evaporating tube provided in the waste heat boiler. A superheater that superheats steam, an exhaust gas treatment facility that removes corrosive components from the product gas discharged from the waste heat boiler, and a gas-fired boiler that burns the product gas treated by the exhaust gas treatment device A superheater that is provided in the gas-fired boiler and superheats steam from an evaporator pipe provided in the gas-fired boiler, and the outside of a steam pipe that constitutes a superheater in the waste heat boiler is provided. This is a facility for utilizing gas produced by a gasification and melting furnace, which is covered with a cover material made of a ceramic alloy composite material.

In the facility for utilizing gas produced by the gasification and melting furnace having the above structure, the steam pipe constituting the superheater provided in the waste heat boiler is covered with a cover material made of a ceramic alloy composite material. hot superheated steam in the boiler, even if high pressure prevents corrosion caused by corrosive components contained in the product gas, and further, corrosive components contained in the product gas at the exhaust gas treatment facility, i.e. HCl, Cl _2, SO _2, etc. It removes sulfur oxides and fly ash to obtain a clean product gas from which substances causing molten salt corrosion have been removed.Therefore, when using a gas-fired boiler to burn the product gas and recover heat with a superheater, High-temperature, high-pressure superheated steam can be used, and the power generation efficiency can be further improved.

[0032]

FIG. 1 is a schematic diagram showing a first embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

The generated gas containing combustible gas such as carbon monoxide and hydrogen or methane generated in the gasification melting furnace 1 is introduced into the waste heat boiler 2. The water in the evaporating pipe 10 a provided in the waste heat boiler 2 is heated by the recovered heat from the generated gas introduced into the waste heat boiler 2, becomes steam, and is collected in the steam drum 9. In other words, the generated gas introduced into the waste heat boiler 2 is partially recovered by the waste heat boiler 2, and the gas is cooled and discharged.

The product gas discharged from the waste heat boiler 2 is sent to an exhaust gas treatment facility 3 to remove corrosive components contained in the product gas. Here, examples of the corrosive component include sulfur compounds such as HCl, Cl ₂ , and SO ₂ , corrosive salts contained in fly ash in generated gas, and the like.

As the exhaust gas treatment equipment 3, a dry gas treatment equipment or a wet gas treatment equipment can be used. For example, it is preferable that the dry gas processing facility be a facility having a slaked lime sprayer and a bag filter, and the wet gas processing facility be a gas cleaning tower that sprays a chemical such as caustic soda.

The generated gas after the corrosive component is removed in the exhaust gas treatment equipment 3 is sent to a gas-fired boiler 4.
There it burns. In the gas-fired boiler 4, there is an evaporating tube 1
0b and a superheater 7 are provided.
The water inside is heated by the heat generated by the combustion in the gas-fired boiler 4 and is collected as steam in the steam drum 9. The saturated steam collected in the steam drum 9 from the evaporating tube 10b is supplied to the evaporating tube 10 provided in the waste heat boiler 2.
a to the superheater 7 provided in the gas-fired boiler 4 together with the saturated steam collected in the steam drum 9 and further heated by the heat generated by the combustion in the gas-fired boiler 4 to become superheated steam, The power is sent to a power generation turbine 8 in a power generation facility attached to the boiler 4 to generate power. further,
An evaporator for collecting steam from the exhaust gas after heat recovery by the superheater 7 of the gas-fired boiler 4 to obtain steam, or a feedwater heater for obtaining heated water may be provided. The exhaust gas discharged from the gas-fired boiler 4 is discharged from the chimney 6 to the outside.

Here, the generated gas introduced into the gas-fired boiler 4 contains no corrosive components because the corrosive components have been removed in the exhaust gas treatment facility 3, and the causative substances of molten salt corrosion are removed. Therefore, the superheated steam in the superheater 7 provided in the gas-fired boiler 4 is heated to a higher temperature and a higher pressure than the conditions of about 300 ° C. and about 30 kg / cm ² which are performed in the conventional gasification and melting system. Temperature between 500 and 56
Even at 0 ° C and a pressure of about 100 kg / cm ² , the superheater 7
There is no molten salt corrosion of the steam pipe inside. Therefore, high-efficiency power generation by increasing the temperature and pressure of the steam in the superheater 7 becomes possible. Further, since there is no need to frequently replace the steam pipe in the superheater 7 or to use an expensive corrosion-resistant alloy material such as a high Ni-Cr-Mo material for the evaporator pipe, the running cost and the equipment cost can be increased. Efficient power generation becomes possible.

FIG. 2 is a schematic diagram showing a second embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.
The dust remover 20a is provided in a gas flow path between the gasification melting furnace 1 and the waste heat boiler 2. Here, the same parts as those in FIG. 1 are given the same numbers.

As the dust remover 20a provided in the gas flow path between the gasification melting furnace 1 and the waste heat boiler 2, for example, a dust remover using a coke filter, a cyclone or the like can be used. The dust remover using the coke filter and the cyclone is capable of removing dust even in a high temperature state where the gas temperature is 700 to 1000 ° C., and thus is suitable for performing dust removal of a high-temperature generated gas generated in a gasification and melting furnace. is there. By providing a dust remover on the upstream side of the waste heat boiler, fly ash, which is a cause of molten salt corrosion in the superheater of the gas-fired boiler, is removed.
In addition to removing sulfur oxides such as l ₂ and SO ₂ and fly ash, molten salt corrosion of the superheater steam pipe of the gas-fired boiler can be reliably prevented. As a result, the temperature of the superheated steam of the superheater can be increased to a high temperature and the power generation efficiency can be improved. Further, it is possible to prevent dust from adhering to the waste heat boiler and lowering the heat recovery efficiency.

FIG. 3 is a schematic diagram showing a third embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.
The dust remover 20b is provided in a gas flow path between the waste heat boiler 2 and the exhaust gas treatment equipment 3. Here, the same parts as those in FIG. 1 are given the same numbers.

As the dust remover 20b provided in the gas flow path between the waste heat boiler 2 and the exhaust gas treatment equipment 3, the generated gas introduced into the dust remover 20b is partially recovered by the waste heat boiler 2 and the gas is recovered. Since the temperature is lowered to about 600 ° C. or less, a dust remover using a ceramics filter can be used in addition to the dust remover using the coke filter and the cyclone described in the second embodiment. Here, as ceramics used for the ceramics filter, A
Ceramics containing 70% or more of l, Si, and O ₂ as main components, for example, a composite material such as Al ₂ O ₃ and SiO ₂ can be used. By providing the dust remover 20b in the gas flow path between the waste heat boiler 2 and the exhaust gas treatment equipment 3, fly ash, which is a cause of molten salt corrosion in the superheater of the gas fired boiler, is removed. HCl, Cl ₂ ,
In addition to removing sulfur oxides such as SO ₂ and fly ash, it is possible to reliably prevent molten salt corrosion of the superheater steam pipe of the gas-fired boiler. As a result, the temperature of the superheated steam of the superheater can be increased to a high temperature and the power generation efficiency can be improved. In addition, it is possible to reduce the load on the exhaust gas treatment equipment 3 downstream of the dust remover 20b, and it is possible to reduce the equipment cost and operation cost of the exhaust gas treatment equipment.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.
A gas storage facility 21 for storing product gas is provided upstream of the gas-fired boiler 4. Here, the same parts as those in FIG. 1 are given the same numbers. In FIG. 4,
The gas storage facility 21 is provided in a gas flow path between the exhaust gas treatment facility 3 and the gas-fired boiler 4.
Is not limited to this position, and may be provided in the gas flow path between the waste heat boiler 2 and the exhaust gas treatment equipment 3.

The gas storage facility 21 preferably has a capacity capable of storing, for example, an amount of the generated gas generated in the gasification and melting furnace 1 for about 1 to 10 minutes. As a result, it is possible to absorb the amount of the generated gas generated in the gasification melting furnace 1 and the flammable gas component ratio, that is, the time variation of the retained calorific value, and level it, and supply the gas to the gas-fired boiler 4 in the subsequent stage. It is possible to stabilize the properties and amount of the generated gas. For this reason, the superheated steam condition is stabilized, so that the power generation efficiency can be further improved. In addition, it is easy to adjust the amount of combustion air supplied to the gas-fired boiler, and the N
Low oxygen operation for suppressing the amount of Ox is also facilitated.

FIG. 5 is a schematic diagram showing a fifth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.
A desulfurization facility 22 is provided downstream of the gas-fired boiler 4. Here, the same parts as those in FIG. 1 are given the same numbers.

The desulfurization equipment 22 preferably has, for example, a slaked lime sprayer and a bag filter.
Thereby, sulfur oxides and dust in the exhaust gas discharged from the gas-fired boiler 4 are removed, so that the exhaust gas can be more reliably cleaned.

FIG. 6 is a schematic diagram showing a sixth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention. Here, the same parts as those in FIG. 1 are given the same numbers.

The generated gas containing combustible gas such as carbon monoxide, hydrogen and methane generated in the gasification melting furnace 1 is introduced into the waste heat boiler 12. The waste heat boiler 12
Inside there is provided an evaporating tube 10c and a superheater 17,
The water in the evaporating pipe 10 c is heated by the recovered heat from the generated gas introduced into the waste heat boiler 12, becomes steam, and is collected in the steam drum 19. The saturated steam collected in the steam drum 19 from the evaporating pipe 10c is sent to the superheater 17 also provided in the waste heat boiler 12, and is heated by the recovered heat from the generated gas in the waste heat boiler 12. Then, the steam is turned into superheated steam and sent to the power generation turbine 8 in the power generation facility to generate power.

The outside of the steam pipe in the superheater 17 is covered with a cover material made of a ceramic alloy composite material having excellent corrosion resistance. By covering the outside of the steam pipe in the superheater 17 with a cover material made of a ceramic alloy composite material, even if the temperature of the steam in the superheater 17 is raised to a high temperature and a high pressure, the superheater due to the corrosive components contained in the generated gas is used. 17
Since corrosion of the steam pipe in the inside can be prevented, high-efficiency power generation by increasing the temperature and pressure of the steam becomes possible.

The ceramic alloy composite material contains Al and AlN, and contains AlN of 1 wt% or more and 90% or more.
It is preferable to use a sintered body of which the total ratio of (Al + AlN + AlON) is 50 wt% or more and 100 wt% or less. By covering the outside of the steam pipe in the superheater 17 with the cover material made of the ceramic alloy composite material, the superheated steam temperature in the
The temperature can be set to 60 ° C., and more efficient power generation becomes possible.

AlN, which is aluminum nitride, is a material having excellent corrosion resistance among ceramic materials.
Because of its relatively high hardness, it has excellent abrasion resistance. Further, it has an extremely high thermal conductivity, a low coefficient of thermal expansion, and a relatively low modulus of elasticity, so that it has a feature that is relatively resistant to thermal shock. As described above, AlN is a material having both excellent corrosion resistance and wear resistance and relatively excellent thermal shock resistance.

Along with AlN, metal aluminum A
l is also a material having extremely good heat conduction and is also a metal that is advantageous for reducing thermal shock. In the process of manufacturing a cover material made of a ceramic alloy composite material, most of Al
₂ reacts with changes to AlN, Al unreacted in the AlN
Are dispersed, and AlN strengthens the bonding force between the particles.

With this configuration, even if the sintered body receives a thermal shock, AlN prevents shape deformation, and Al surrounded by AlN has a function to reduce the thermal shock. Therefore, in order to maintain this mechanism, AlN must be contained at least 1 wt% or more. If the AlN content is less than 1 wt%, the bonding force between the particles is small and insufficient, and
%, The properties of the ceramic alloy composite material approach ceramics and become brittle, which is not preferable. Therefore,
The content ratio of AlN is preferably 1 wt% or more and 90 wt% or less.

In addition, the ceramic alloy composite material includes
Al and AlON are dispersed in AlN. Therefore (A
l + AlN + AlON) is 50 wt% or more 1
If the content is not more than 00 wt%, the ceramic alloy composite material
The cover material made of a material has high thermal shock while having thermal deformation characteristics.
It is possible to maintain the impact. Also contains aluminum
In the product gas derived from the gasification and melting furnace 1
Of the oxide contained in the powder has poor wettability to dust
And the content ratio of (Al + AlN + AlON) is 50 wt.
% Or more, the property of not adhering the dust is effective.
Be conducted. In addition, the ceramic alloy composite material
AlON is eliminated in the production of cover materials
Using AlN alone to increase the ratio from 50 wt% to 100 wt%
It can be below. In addition, AlON is Al, O,
N is a generic term for solid-liquid, such as Al ₁₁O₁₅N, AlON,
Al₁₉₈O₂₈₈N_Four, Al₂₇O₃₉N, Al_TenN₈O_Three, Al₉
O _ThreeN₇, SiAl₇O_TwoN₇, Si_ThreeAl_ThreeO_4.5N_FiveIs raised
Can be

In FIG. 6, the generated gas led out of the gasification / melting furnace 1 and introduced into the waste heat boiler 12 is partially recovered in the waste heat boiler 12, and its gas temperature is lowered to be discharged. You.

The product gas discharged from the waste heat boiler 12 is sent to an exhaust gas treatment facility 3 to remove corrosive components contained in the product gas.

The generated gas after the corrosive component is removed in the exhaust gas treatment equipment 3 is sent to a gas-fired boiler 4 where it is burned. An evaporator tube 10b and a superheater 7 are provided in the gas-fired boiler 4, and the evaporator tube 1
The water in Ob is heated by the heat generated by the combustion in the gas-fired boiler 4 and is collected as steam in the steam drum 9. The saturated steam collected from the evaporating pipe 10b to the steam drum 9 is provided in the gas-fired boiler 4 together with the saturated steam collected from the evaporating pipe 10a provided in the waste heat boiler 2 to the steam drum 9. The steam is then sent to the superheater 7 and further heated by the heat generated by the combustion in the gas-fired boiler 4 to become superheated steam.

The superheated steam heated by the superheater 7 is sent to the power generation turbine 8 in the power generation facility together with the superheated steam heated by the superheater 17 in the waste heat boiler 12 to generate power. The exhaust gas discharged from the gas-fired boiler 4 is:
It is released from the chimney 6 to the outside.

Here, as described in the first embodiment, the generated gas introduced into the gas-fired boiler 4 is subjected to the treatment for removing the corrosive components in the exhaust gas treatment equipment 3 and thus causes the melting corrosion. Gas-fired boiler 4 containing no corrosive components
Even if the temperature of the steam in the superheater 7 provided therein is increased and the pressure is increased, there is no fear that the molten salt corrosion of the steam pipe in the superheater 7 occurs. Therefore, high-efficiency power generation by increasing the temperature and the pressure of the steam in the superheater 7 becomes possible.

[0059]

As described above, according to the present invention, a gasification and melting furnace capable of high-efficiency power generation without increasing running costs and equipment costs even when the temperature of steam in a superheater is increased to a higher temperature and pressure. Equipment for utilizing the generated gas is provided.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a first embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 2 is a schematic configuration diagram showing a second embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 3 is a schematic configuration diagram showing a third embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 4 is a schematic configuration diagram showing a fourth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 5 is a schematic configuration diagram showing a fifth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 6 is a schematic configuration diagram showing a sixth embodiment of a facility for utilizing gas produced by a gasification and melting furnace according to the present invention.

FIG. 7 is a diagram showing an example of a facility for utilizing gas generated by a gasification and melting furnace using a gasification and melting furnace according to a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gasification melting furnace 2,12 Waste heat boiler 3 Exhaust gas treatment equipment 4 Gas fired boiler 5 Secondary combustion chamber 6 Chimney 7,17 Superheater 8 Power generation turbine 9,19 Steam drum 10a, 10b, 10c, 10d, 10e Evaporation Pipe 20a, 20b Dust remover 21 Gas storage equipment 22 Desulfurization equipment

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C10K 1/02 C10K 1/02 F22B 37/04 F22B 37/04 37/10 602 37/10 602B F22G 1 / 16 F22G 1/16 3/00 3/00 A F23G 5/46 F23G 5/46 A F23J 15/04 F23J 15/00 E (72) Inventor Yasuo Suzuki 1-1-2 Marunouchi, Chiyoda-ku, Tokyo Japan Inside Kokan Co., Ltd. (72) Takashi Noto, Inventor 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. Inside the company (72) Inventor Yuichi Yamakawa 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Inside Nihon Kokan Co., Ltd. (72) Tomohiro Yoshida 1-1-1, Marunouchi, Chiyoda-ku, Tokyo No. 2 Nihon Kokan Co., Ltd. F term (reference) 3K065 AA24 AB02 AB03 AC01 AC02 AC11 AC19 JA05 JA18 3K070 DA03 DA05 DA07 DA09 DA16 DA23 DA32 DA38 DA56 DA77 4H060 AA02 BB03 BB25 BB38 CC03 GG08

Claims (8)

[Claims] 1. A waste heat boiler to which a product gas generated in a gasification and melting furnace is introduced, an exhaust gas treatment facility for removing corrosive components from the product gas discharged from the waste heat boiler, and the exhaust gas treatment A facility for utilizing gas produced by a gasification and melting furnace, comprising: a gas-fired boiler that burns produced gas processed by the facility and recovers superheated steam. 2. A facility for utilizing gas produced by a gasification and melting furnace according to claim 1, wherein a dust remover is provided in a gas flow path between the gasification and melting furnace and the waste heat boiler. 3. The facility according to claim 1, wherein a dust remover is provided in a gas flow path between the waste heat boiler and the exhaust gas treatment facility. 4. A facility for utilizing gas generated by a gasification and melting furnace according to claim 1, wherein a gas storage facility for storing generated gas is provided upstream of the gas-fired boiler. . 5. The facility for utilizing gas produced by a gasification and melting furnace according to claim 1, wherein a desulfurization facility is provided downstream of the gas-fired boiler. 6. A waste heat boiler into which a product gas generated in a gasification and melting furnace is introduced, an exhaust gas treatment facility for removing corrosive components from the product gas discharged from the waste heat boiler, and the exhaust gas treatment A gas-fired boiler for burning the product gas processed in the facility; and a waste heat boiler and / or
Or a superheater for superheating steam from an evaporating tube provided in a gas-fired boiler. 7. A steam pipe, which is provided in a waste heat boiler and superheats steam from an evaporator tube provided in the waste heat boiler, and constitutes a superheater in the waste heat boiler. 7. The facility for utilizing gas produced by a gasification and melting furnace according to claim 1, wherein the gas is covered with a cover material made of a ceramic alloy composite material. 8. A waste heat boiler into which a generated gas generated in a gasification and melting furnace is introduced, and superheats steam from an evaporation tube provided in the waste heat boiler and provided in the waste heat boiler. A superheater, an exhaust gas treatment facility for removing corrosive components from product gas discharged from the waste heat boiler, a gas-fired boiler for burning the product gas treated by the exhaust gas treatment device, and the gas-fired boiler And a superheater for superheating steam from an evaporator tube provided in a gas-fired boiler, and the outside of a steam tube constituting a superheater in the waste heat boiler is made of a ceramic alloy composite material. A facility for utilizing gas produced by a gasification and melting furnace, which is covered with a cover material.