KR20100018554A - Gasification melting equipment and method of feeding air for combustion in melting furnace of gasification melting equipment - Google Patents

Abstract

A gasification melting equipment and method of feeding air for combustion in a melting furnace of gasification melting equipment, devised to prevent sticking of clinker to a superior area internal wall of primary combustion chamber of melting furnace. The gasification melting equipment (10) comprises a gasification furnace (20), a melting furnace (30) capable of combusting pyrolysis gas contained in produced gases therefrom and also converting ash contents to a fused slag and a gas duct (40) for guiding the produced gases within the gasification furnace (20) to a produced gas introduction port of the melting furnace (30). The produced gas introduction port of the melting furnace (30) is provided on a superior area side wall of primary combustion chamber (31) thereof. The gas duct (40) in the vicinity of the produced gas introduction port is provided with primary combustion air supply nozzles (41a-41c, 42a-42c) for supply of combustion air amounting to 70% or more of the total quantity of combustion air for the primary combustion chamber of the melting furnace (30).

Description

Gas melting melting equipment and method of feeding air for combustion in melting furnace of gasification melting equipment}

The present invention relates to a gas supply dissolution facility and an air supply method for melting furnace combustion.

Gasification melting facilities are facilities that form the center of gasification melting facilities, and generally, gasification furnaces for generating pyrolysis gases (pyrolysis gas and char) by pyrolyzing waste such as municipal waste and industrial waste, It is introduced from the product gas inlet by a gas duct connected to the gasifier to combust the pyrolysis gas (combustible gas) in the product gas, and has a melting furnace for dissolving and slag ash in the product gas.

In this kind of gasification melting facility, as shown in FIG. 7 and FIG. 8, a clumper 84 is formed on the upper inner wall of the primary combustion chamber 82 of the melting furnace 80 (the inner wall of the furnace part of the melting furnace 80). Easy to attach When the molten metal 84 grows, the residence time of the product gas required for the proper combustion of the product gas introduced into the primary combustion chamber 82 from the gas duct 86 cannot be maintained and the combustion efficiency is lowered, The interior shape of the primary combustion chamber 82 is not properly maintained, and the swirling product gas flow in the primary combustion chamber is inhibited, and the slugization rate (capture rate of ash in the production gas) is lowered. In addition, in the gasification melting facility, the molten metal 84 grows and the primary combustion chamber 82 is blocked, or the melting furnace 80 may be damaged due to the falling of the molten metal 84 or the slug outlet may be blocked. have.

Conventionally, Patent Literature 1 describes a technique for preventing adhesion of the molten metal mass to a melting furnace of a gasification melting furnace facility having the above aspect. The melting furnace described in Patent Document 1 includes a side wall and a ceiling wall constituting the primary combustion chamber, and a plurality of gas supply nozzles for combustion, which are respectively provided on the side wall and the ceiling wall and open at the tip portion thereof. As the combustion gas (combustion air) is blown from the nozzle into the primary combustion chamber, the mixing of the combustion gas and the generated gas can be promoted more rapidly, and the temperature can be raised quickly. The adhesion of the molten metal in the upper inner wall of the primary combustion chamber is prevented.

However, in the melting furnace, at the point of preventing the adhesion of the molten metal in the upper inner wall of the primary combustion chamber of the melting furnace, the position where the combustion air supply nozzle for supplying the combustion air for the primary combustion of the melting furnace is provided. There is a need for further improvement.

[Patent Document 1] Japanese Patent Laid-Open No. 2003-4214

The present invention relates to a gasification melting facility and a gasification melting facility, which make it possible to more effectively prevent the attachment of a molten metal to the upper inner wall of the primary combustion chamber of the melting furnace in a gasification melting facility having a gasifier and a melting furnace and a gas duct connecting them. It is an object of the present invention to provide a method for supplying air for combustion in a furnace.

As a means for achieving the above object, a gasification dissolution facility according to the present invention includes a gasification furnace for pyrolyzing waste to generate a product gas, and a product gas inlet, and the product gas introduced from the product gas inlet. A melting furnace for dissolving and slugizing ash in the product gas at the same time as burning the pyrolysis gas in the gas, and connecting the gasifier and the melting furnace to guide the product gas generated in the gasifier to the product gas inlet. Equipped with a gas duct. The product gas inlet is provided on the upper sidewall of the primary combustion chamber of the melting furnace, and is 70% of the total amount of combustion air supplied to the primary combustion chamber of the melting furnace at a portion near the product gas inlet with respect to the gas duct. The 1st combustion air supply nozzle which supplies above combustion air is provided.

In addition, the present invention includes a gasification furnace and a product gas inlet for pyrolyzing the waste to generate a product gas, and simultaneously burn the pyrolysis gas in the product gas introduced from the product gas inlet, For combustion in a melting furnace of a gasification melting plant having a melting furnace for dissolving slug of ash, and a gas duct which connects the gasifier with the melting furnace and directs the generated gas generated by the gasifier to the producing gas inlet. A method for supplying air, wherein the product gas inlet is provided on the upper sidewall of the primary combustion chamber of the melting furnace, and a first combustion air supply nozzle is provided near the product gas inlet of the gas duct. Flesh and lead fed from the first combustion air supply nozzle to the primary combustion chamber of the melting furnace Supplying combustion air of at least 70% of the total amount of air required.

In the melting furnace combustion air supply method of the said gasification melting facility and the said gasification melting facility, 1st combustion air is provided in the gas duct in the vicinity of the product gas inlet provided in the upper side wall of the primary combustion chamber of the said melting furnace. Since a supply nozzle is provided and 70% or more of combustion air is supplied from the nozzle to the primary combustion chamber of the melting furnace, it is guided into the primary combustion chamber from the gasifier through the gas duct. In a state where the amount of generated gas of the generated gas is large, the combustion gas by the first combustion air supply nozzle, which occupies most of the total amount of the combustion air, can be mixed. This makes it possible to prevent the deposition of molten metal in the upper inner wall of the primary combustion chamber of the melting furnace by heating the furnace temperature of the upper part of the primary combustion chamber of the melting furnace to a temperature higher than the melting temperature of the ash contained in the product gas.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the gasification dissolution facility which concerns on one Embodiment of this invention.

It is a top view which shows the principal part of the gas duct and swirl flow melting furnace in FIG.

3 is a side view illustrating III of FIG. 2.

4 is a side view illustrating IV of FIG. 2.

5 is a cross-sectional view taken along line V-V of FIG.

6 is a distribution ratio η of the amount of combustion air supply by the first combustion air supply nozzle installed in the gas duct to the total amount of combustion air for the primary combustion chamber of the swirl flow melting furnace, and the furnace temperature T above the primary combustion chamber. This graph shows the relationship with.

7 is a plan view showing a state of adhesion of molten metal in the upper inner wall of the primary combustion chamber of the swirl flow melting furnace.

It is a side view which shows the attachment state of the molten metal mass in the upper inner wall of the primary combustion chamber of a swirl flow furnace.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described with reference to drawings. BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the whole structure of the gasification dissolution facility which concerns on one Embodiment of this invention.

The gasification melting facility 10 shown to FIGS. 1-5 is equipped with the fluidized-bed gasification furnace 20, the swirl flow melting furnace 30, and the gas duct 40. As shown in FIG. In the fluidized-bed gasification furnace 20, pyrolysis gas and char generated gas B are generated by pyrolysis of the waste A. The swirl flow melting furnace 30 includes a product gas inlet 33, and the generated gas B from the fluidized bed gasifier 20 in the swirl flow melting furnace 30 from the product gas inlet 33. ) Is introduced. In the swirl flow melting furnace 30, the pyrolysis gas (combustible gas) in the said production gas B burns, and the ash in the said production gas B melts and sludges. The gas duct 40 connects the fluidized-bed gasifier 20 and the swirl flow melting furnace 30 to convert the generated gas B generated in the fluidized-bed gasifier 20 into the swirl flow melting furnace 30. To the generated gas inlet (33).

The swirl flow melting furnace 30 is provided with the primary combustion chamber 31 and the secondary combustion chamber 32. The generated gas B from the fluidized-bed gasifier 20 passes through the gas duct 40, and turns into the swirl flow melting furnace. It is supplied to the primary combustion chamber 31 of 30, and forms swirl flow in the said primary combustion chamber 31. As shown in FIG. The primary combustion chamber 31 is provided with a ceiling wall, and the 2nd combustion air supply nozzle 34 is provided in the government part (one in the figure). The said 2nd combustion air supply nozzle 34 is equipped with the front end part which opens, and blows the combustion air f2 into the primary combustion chamber 31 from the front end part.

2-4 is a figure which shows the principal part of the said gas duct 40 and the said swirl flow melting furnace 30, FIG. 2 is a top view, FIG. 3 is a side view of the III part in FIG. 2, FIG. Part IV side view.

As shown in FIG. 2, the product gas inlet 33 is provided on the upper sidewall of the primary combustion chamber 31 of the swirl flow melting furnace 30, and the gas duct 40 is formed in the product gas inlet 33. ) Is connected. In the gas duct 40, a plurality of first combustion air supply nozzles 41a to 41c and 42a to 42c are provided at a portion near the product gas inlet 33. It is installed. These 1st combustion air supply nozzles 41a-41c, 42a-42c are equipped with the front-end | tip part which is opened, and blows the combustion air f1 into the primary combustion chamber 31 from the front-end | tip part, The said production | generation It is provided in the inclined attitude so that it may flow along the flow direction of gas B (refer FIG. 2).

More specifically, the first combustion air supply nozzles 41a to 41c are disposed on sidewalls 43 of the outside of the gas duct 40 in a vertically parallel manner, and are separated from the outer sidewalls 43. It is arranged to supply the combustion air while inclining in the form along the flow direction of the product gas (B). On the other hand, the said 1st combustion air supply nozzles 42a-42c are arrange | positioned at the inner side wall 44 of the said gas duct 40 in the form parallel to each other up and down, and from the said inner side wall 44 It is arrange | positioned so that combustion air may be supplied, inclining so that it may flow along the flow direction of the product gas B. FIG.

FIG. 5 is a cross-sectional view taken along the line VV of FIG. 3. As shown in FIG. 5, the first combustion air supply nozzle 41a is generated in a plan view in order to increase the furnace temperature (room temperature) of the upper portion of the primary combustion chamber 31. It is installed so that combustion air f1 is blown toward the intersection position P1 between the duct width center line CL of the gas duct 40 and the generated gas inlet 33 in the vicinity of the gas inlet 33. It is. That is, the position of the nozzle 41a is determined so that an extension line of the axis line of the first combustion air supply nozzle 41a passes through the intersection position P1 in plan view.

If the 1st combustion air supply nozzle 41a blows up the combustion air f1 toward the position (for example, position P2) upstream from the said intersection position P1 with respect to planar view, In this case, the temperature in the gas duct 40 rises, and the gas duct 40 may be blocked by the melted mass. In contrast, the first combustion air supply nozzle 41a blows the combustion air f1 toward a position downstream of the intersection position P1 (for example, the position P3) with respect to the planar view. In the case where it is provided, since the combustion time until the generated gas B in which combustion air is mixed collides with the inner wall of the primary combustion chamber 31 is insufficient, the internal furnace temperature of the upper part of the primary combustion chamber 31 is adjusted. It becomes difficult to obtain the effect of high temperature.

Moreover, the said 1st combustion air supply nozzle 41a is for combustion toward the position (for example, position P4) outside of the duct width center line CL with respect to the said intersection position P1 with respect to planar view. In the case where the air f1 is provided to blow air, since the combustion time until the generated gas B in which combustion air is mixed impinges on the inner wall of the primary combustion chamber 31 is insufficient, the primary combustion chamber ( 31) It is difficult to obtain the effect of increasing the temperature in the upper furnace. On the other hand, the said 1st combustion air supply nozzle 41a is for combustion toward the position (for example, position P5) inward of the duct width center line CL with respect to the said intersection position P1 with respect to planar view. In the case where the air f1 is provided to blow air, the combustion air f1 hinders the flow of the swirl flow in the primary combustion chamber 31, thereby reducing the slugization rate (the ash collection rate). have.

Therefore, as described above, the first combustion air supply nozzle 41a has the air for combustion toward the intersection position P1 between the duct width center line CL and the product gas inlet 33 in plan view. It is preferable to install so that f1) may be blown. This point also applies to other combustion air supply nozzles 41b, 41c and 42a to 42c. For this reason, the combustion air supply nozzles 41a to 41c according to the embodiment are provided on the side wall 43 of the gas duct 40 outside of the duct width center line CL and the side wall ( The combustion air supply nozzles 42a to 42c are arranged to blow the combustion air toward the intersection position P1 from 43, while the combustion air supply nozzles 42a to 42c are located at the inner side of the gas duct 40 than the duct width centerline CL. It is provided in the side wall 44, and is arrange | positioned so that combustion air may be blown from this side wall 44 toward the said intersection position P1.

The swirl flow melting furnace 30 is different from the conventional melting furnace in which a plurality of combustion air supply nozzles are distributed in the upper portion of the primary combustion chamber, and the swirl flow melting furnace 30 is different from the conventional melting furnace 30. First combustion air supply nozzles 41a to 41c and 42a to 42c provided in the gas duct 40 in the vicinity of the product gas inlet 33 provided on the upper sidewall of the primary combustion chamber 31 and the primary According to the 2nd combustion air supply nozzle 34 provided in the ceiling wall of the combustion chamber 31, it is comprised so that the combustion air for the primary combustion chamber of the swirl flow melting furnace 30 may be supplied. And a distribution ratio between the combustion air supply amount by the first combustion air supply nozzles 41a to 41c and 42a to 42c and the combustion air supply amount according to the second combustion air supply nozzle 34. The first combustion air supply nozzles 41a to 41c and 42a to 42c are set to supply 70% or more of combustion air of the total amount of combustion air supplied to the primary combustion chamber 31.

FIG. 6 is a distribution ratio η of the amount of combustion air supply by the first combustion air supply nozzle provided in the gas duct 40 to the total amount of combustion air for the primary combustion chamber of the swirl flow melting furnace 30, and the primary It is a graph which shows the relationship with the furnace temperature T of a combustion chamber upper part.

As shown in FIG. 6, when the said distribution ratio (eta) is 46%, the measured value of the furnace temperature T is 1015 degreeC-1149 degreeC (average value 1082 degreeC), and when the said distribution ratio (eta) is 63%, the measured value of the furnace temperature T is 1154 degreeC- 1184 degreeC (average value 1176 degreeC), and the distribution ratio (eta) was 84%, the measured value of the furnace temperature T was 1165 degreeC-1238 degreeC (average value 1201 degreeC). From this test result, if the distribution ratio (eta) is 70% or more, the conclusion that the furnace temperature T of the upper part of a primary combustion chamber can be heated up in the form exceeding 1200 degreeC which is the temperature more than melting | fusing point of ash contained in char. Could get That is, according to the result shown in FIG. 6, it turned out that distribution ratio (eta) may be set to the form which satisfy | fills 70% or more.

In addition, the amount of combustion air (air amount of the injected air E shown in FIG. 1), the first combustion air supply nozzles 41a to 41c, 42a to 42c, and the second The combustion air amount for the primary combustion chamber supplied by the combustion air supply nozzle 34 is all an air ratio (air ratio is the ratio of the amount of air supplied with respect to the minimum amount of air required for complete combustion of the combustibles in the waste material which is a raw material). ), 1.0 to 1.2 are appropriate. This is because the product gas, which is a mixture of solid fuel and gaseous fuel, is efficiently burned, and even if the air ratio is low or high, the required furnace temperature in the upper part of the primary combustion chamber cannot be obtained. In addition, although the flow velocity of the combustion air for a primary combustion chamber supplied by the 1st and 2nd combustion air supply nozzle is determined by blower capability and piping design, it is 30-100 m / s, for example. The relatively high flow rate promotes the mixing of the combustion air with the product gas to increase the combustion efficiency.

In addition, the supply rate of the product gas in the swirl flow melting furnace 30 from the fluidized-bed gasifier 20 is set to 15-25 m / s (more preferably, 18-20 m / s). The feed rate of the product gas is preferably high, but if it is too high, the collision pressure in the inner wall of the primary combustion chamber 31 of the swirl flow furnace 30 will rise excessively, causing adhesion of the molten metal. It's a good idea to regulate it with / s.

Next, the melting furnace combustion air supply method of the gasification melting installation 10 using the gasification melting installation 10 comprised in said form is demonstrated.

In the fluidized-bed gasification furnace 20, the air E inserted and inserted from the bottom of the hearth forms a fluidized bed by flowing the fluid medium C, such as sand. Then, the waste A introduced into the fluidized-bed gasifier 20 is pyrolyzed (gasified) in the fluidized bed. Incombustibles D which are not gasified in this waste A are discharged out of the furnace at the lower part of the fluidized bed.

The product gases (pyrolysis gas and char) B generated in the fluidized-bed gasifier 20 are led to the product gas inlet 33 of the swirl flow melting furnace 30 by the gas duct 40. This product gas B is for combustion for primary combustion chambers from the first combustion air supply nozzles 41a to 41c and 42a to 42c provided in the gas duct 40 in the vicinity of the product gas inlet 33. While mixing with the air f1, it is introduced from the product gas inlet 33 into the primary combustion chamber 31 of the swirl flow melting furnace 30 to form swirl flow in the primary combustion chamber 31, and furthermore, primary combustion chamber. From the 2nd combustion air supply nozzle 34 provided in the ceiling wall of 31, it mixes with the combustion air f2 for a primary combustion chamber, and is combusted in the primary combustion chamber 31. As shown in FIG. At this time, when supplying the combustion air f1 and f2 for a primary combustion chamber, the 1st combustion air supply nozzle 41a-41c, 42a-42c carries out the 1st combustion of the swirl flow melting furnace 30. More than 70%, for example 75% of combustion air of the total amount of practical combustion air is supplied.

The above method is a state in which a large amount of heat generated from the generated gas B guided to the primary combustion chamber 31 by the gas duct 40 from the fluidized-bed gasifier 20, the majority of the generated gas B and the entire amount of combustion air. Combustion air f1 by the first combustion air supply nozzles 41a to 41c and 42a to 42c to occupy is mixed to make it possible to burn the product gas B at once. This makes it possible to raise the furnace temperature of the upper part of the primary combustion chamber 31 to a melting temperature of 1200 ° C. or more of ash contained in char, thereby preventing adhesion of molten metal in the upper inner wall of the primary combustion chamber 31. Let's do it.

The melted ash flows down by moving along the inner wall of the primary combustion chamber 31, flows down the bottom of the swirl flow melting furnace (slug separator) together with the ash dissolved in the lower portion of the primary combustion chamber 31, and the slug outlet 35 From the sludge H and discharged to the outside. In addition, the product gas guide | induced to the secondary combustion chamber 32 from the primary combustion chamber 31 mixes with the combustion air G for secondary combustion chambers in the secondary combustion chamber 32, and is completely combusted. The combustion exhaust gas J after complete combustion in the secondary combustion chamber 32 is discharged from the swirl flow melting furnace 30 and passed through a heat recovery device, a bug filter, and the like, and discharged into the atmosphere.

As described above, according to the melting furnace combustion air supply method of the gasification melting facility according to the present invention, adhesion of the molten metal mass on the upper inner wall of the primary combustion chamber 31 of the swirl flow melting furnace 30 can be prevented. Therefore, it is possible to prevent damage to the swirl flow melting furnace 30 due to the fall of the molten metal and blockage of the slug outlet 35, and to prevent blockage of the primary combustion chamber 31 of the swirl flow melting furnace 30 due to the growth of the melt mass. It is possible to prevent the reduction of the combustion efficiency and the decrease of the slug rate by the deposition and growth of the molten metal and the ingot, and as a result, it becomes possible to perform stable operation for a long time in an appropriate state of the gasification dissolution facility 10. .

That is, according to the melting furnace combustion air supply method of the gasification melting installation and the gasification melting installation which concerns on this invention, the 1st combustion air is provided to a gas duct in the vicinity of the product gas inlet provided in the upper side wall of the primary combustion chamber of the said melting furnace. A supply nozzle is provided so that at least 70% of the combustion air supplied from the nozzle to the primary combustion chamber of the melting furnace is supplied to the primary combustion chamber from the gasifier through the gas duct. In the state where the generated calorific value of the generated gas is high, it is possible to mix the generated gas and combustion air by the first combustion air supply nozzle, which occupies most of the total amount of combustion air, whereby The furnace temperature of the upper part of a primary combustion chamber is heated to more than the melting temperature of the ash contained in product gas, and the primary furnace It makes it possible to prevent adhesion of the slag in the upper bars of the inner wall of the chamber. This prevents the melting furnace from damage or the blockage of the slug outlet due to the falling of the molten metal, preventing the blockage of the primary combustion chamber of the melting furnace due to the growth of the molten mass, and the reduction of the combustion efficiency and the slug due to the deposition and growth of the molten mass. It is possible to prevent the reduction in the rate of fire, and as a result, it is possible to perform stable operation of the gasification dissolution facility in an appropriate state over a long period of time.

Here, the said 1st combustion air supply nozzle blows in the combustion air toward the intersection position of the duct width centerline of the said gas duct in the vicinity of the said product gas inlet with respect to planar view, and the said product gas inlet. It is more preferable that it is installed so that it may become. This ensures the combustion time until the generated gas containing combustion air collides with the inner wall of the primary combustion chamber while the temperature in the gas duct is increased to prevent the gas duct from being blocked by the molten metal. It is possible to increase the temperature in the furnace.

In this case, it is more preferable that the first combustion air supply nozzle is installed in the gas duct in a posture that blows the combustion air toward the intersection position while inclining in the form along the duct width center line. This enables a smooth supply of combustion air from the nozzle into the primary combustion chamber.

Moreover, in the said 1st combustion air supply nozzle, it is provided in the side wall of the gas duct which is outside from the said duct width center line, and blows combustion air toward this intersection position from this side wall, and the inside of the said duct width center line. More preferably, a nozzle is provided on the side wall of the gas duct and blows the combustion air from the side wall toward the intersection position. This makes it possible to supply a sufficient amount of combustion air from both side walls of the gas duct toward the intersection position. In addition, since each of the first combustion air supply nozzles is provided to supply combustion air while being inclined along the duct width center line, the combustion air supplied from the outer side wall and the combustion side supplied from the inner side wall. There is little element that air interferes with each other.

In the present invention, the combustion air is supplied to the primary combustion chamber of the melting furnace by the first combustion air supply nozzle and the second combustion air supply nozzle provided on the ceiling wall of the primary combustion chamber of the melting furnace. It is also possible to supply.

The melting furnace combustion air supply method of the gasification melting facility and the gasification melting facility according to the present invention as described above can prevent the adhesion of the molten metal in the upper inner wall of the primary combustion chamber of the melting furnace to bring the gasification melting facility into an appropriate state. It is possible to allow stable operation of the system for a long time.

Claims (10)

In a gasification melting plant, A gasification furnace for pyrolyzing the waste to generate a product gas, A melting furnace provided with a product gas inlet, for burning the pyrolysis gas in the product gas introduced from the product gas inlet, and for dissolving and slag ash in the product gas; A gas duct which connects the gasifier and the melting furnace, and guides the product gas generated in the gasifier to the product gas inlet; The product gas inlet is installed on the upper side wall of the primary combustion chamber of the melting furnace, A first combustion air supply nozzle for supplying combustion air of 70% or more of the total amount of combustion air supplied to the primary combustion chamber of the melting furnace is provided at a portion of the gas duct near the gas duct. Gasification dissolution equipment, characterized in that. The method according to claim 1, The said 1st combustion air supply nozzle is provided so that combustion air may be blown toward the intersection position of the duct width centerline of the said gas duct in the vicinity of the said product gas inlet and the said product gas inlet with respect to planar view. Gasification dissolution equipment, characterized in that. The method according to claim 2, And said first combustion air supply nozzle is installed in said gas duct in such a manner as to blow combustion air toward said intersection position while inclining in a form along said duct width centerline. The method according to claim 3, In the said 1st combustion air supply nozzle, it is a nozzle provided in the side wall of the gas duct outside of the said duct width center line, and blows combustion air toward this intersection position from this side wall, and a gas inside the said duct width center line. And a nozzle which is provided on the side wall of the duct and blows air for combustion from the side wall toward the intersection position. The method according to any one of claims 1 to 4, A second combustion air supply nozzle is provided on the ceiling wall of the primary combustion chamber of the melting furnace, A gasification melting facility, wherein combustion air is supplied from the first and second combustion air supply nozzles to a primary combustion chamber of the melting furnace. A gasification furnace for pyrolyzing the waste to generate a product gas, and having a product gas inlet and burning the pyrolysis gas in the product gas introduced from the product gas inlet and dissolving ash in the product gas to sludge A method for supplying combustion air to a melting furnace of a gasification melting plant equipped with a melting furnace and a gas duct connecting the gasifier and the melting furnace to direct the product gas generated in the gasifier to the product gas inlet. To Installing the product gas inlet on the upper sidewall of the primary combustion chamber of the melting furnace; Providing a first combustion air supply nozzle in the vicinity of the product gas inlet in the gas duct; Supplying combustion air of at least 70% of the total amount of combustion air supplied to the primary combustion chamber of the melting furnace from the first combustion air supply nozzle; Supply method. The method according to claim 6, The combustion air is blown by the first combustion air supply nozzle toward the intersection position of the duct width center line of the gas duct in the vicinity of the product gas inlet and the product gas inlet in plan view. A method of supplying air for melting a furnace of a gasification melting plant. The method according to claim 7, The first combustion air supply nozzle is installed in the gas duct in a manner of blowing the combustion air toward the intersection position while inclined in the form along the duct width centerline, the combustion furnace of the gasification melting facility Air supply method. The method according to claim 8, The first combustion air supply nozzle is provided on a side wall of a gas duct outside the duct width center line and blows combustion air toward the intersection position from the side wall and a gas duct inside the duct width center line. And a nozzle installed on the side wall of the gas blower to blow combustion air from the side wall toward the intersection position. The method according to any one of claims 6 to 9, Providing a second combustion air supply nozzle on a ceiling wall of the primary combustion chamber of the melting furnace; A combustion air supply method for a melting furnace of a gasification melting facility, wherein combustion air for a primary combustion chamber of the melting furnace is supplied from the first and second combustion air supply nozzles.

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