JP2009014334A - Gasification melting equipment and method of feeding air for combustion in melting furnace of gasification melting equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gasification melting equipment and a method of feeding air for combustion in the melting furnace of the gasification melting equipment, capable of preventing sticking of clinker to the upper inner wall of the primary combustion chamber of the melting furnace. <P>SOLUTION: The gasification melting equipment 10 includes a gasification furnace 20, the melting furnace 30 combusting pyrolysis gas contained in produced gas and also converting ash contents into a fused slag, and a gas duct 40 for guiding the produced gas within the gasification furnace 20 to the produced gas introduction port of the melting furnace 30. The produced gas introduction port of the melting furnace 30 is provided on the upper sidewall of the primary combustion chamber 31. First combustion air supply nozzles 41a-41c, 42a-42c for supplying combustion air amounting to 70% or more of the total quantity of combustion air for the primary combustion chamber of the melting furnace 30 are provided in the vicinity of the produced gas introduction port in the gas duct 40. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a gasification melting facility and a method for supplying air for melting furnace combustion in the gasification melting facility.

  The gasification and melting equipment is the equipment that forms the center of the gasification and melting facility. In general, gasification and pyrolysis gas is generated by pyrolyzing waste such as municipal waste and industrial waste. The product gas is introduced from the furnace and the gas duct connected to the gasification furnace through the product gas inlet, and the pyrolysis gas (combustible gas) in the product gas is combusted and the ash content in the product gas is molten slag. And a melting furnace.

  In this type of gasification and melting equipment, as shown in FIGS. 7 and 8, the clinker 84 is likely to adhere to the upper inner wall of the primary combustion chamber 82 of the melting furnace 80 (the inner wall at the top of the melting furnace 80). When this clinker 84 grows, the residence time of the product gas necessary for proper combustion of the product gas introduced from the gas duct 86 into the primary combustion chamber 82 cannot be maintained, and the combustion efficiency is lowered or the primary combustion is performed. The indoor shape of the chamber 82 cannot be maintained properly, and the swirl generation gas flow in the primary combustion chamber is hindered, and the slag conversion rate (the collection rate of ash in the generated gas) decreases. Further, in the gasification and melting facility, the clinker 84 may grow and block the primary combustion chamber 82, or the melting furnace 80 may be damaged or the slag outlet may be blocked due to the clinker 84 falling. .

  Conventionally, Patent Document 1 discloses a technique for preventing the clinker from adhering in the melting furnace of the gasification melting furnace equipment as described above. The melting furnace described in Patent Document 1 includes a side wall and a ceiling wall that constitute a primary combustion chamber, and a plurality of combustion gas supply nozzles that are respectively provided on the side wall and the ceiling wall and that open at the tip. . Combustion gas (combustion air) is blown into the primary combustion chamber from these combustion gas supply nozzles, so that the mixing of the combustion gas and the product gas can be further promoted to quickly raise the temperature. This prevents the clinker from adhering to the upper inner wall of the primary combustion chamber of the melting furnace.

However, in this melting furnace, in order to prevent the clinker from adhering to the upper inner wall of the primary combustion chamber of the melting furnace, the position where the combustion air supply nozzle for supplying combustion air for the primary combustion of the melting furnace is further improved. There is room for.
JP 2003-4214 A (full text)

  An object of the present invention is to more effectively prevent clinker from adhering to the upper inner wall of a primary combustion chamber of a melting furnace in a gasification and melting equipment including a gasification furnace and a melting furnace and a gas duct connecting them. It is an object of the present invention to provide a gasification and melting facility and an air supply method for combustion in the melting furnace of the gasification and melting facility.

  As a means for achieving the above object, a gasification and melting facility according to the present invention has a gasification furnace for generating a product gas by thermally decomposing waste, and a product gas introduction port. The pyrolysis gas in the product gas introduced from the combustion gas is combusted, and a melting furnace for melting ash in the product gas into a molten slag, and the gasification furnace and the melting furnace are connected, and the gasification A gas duct for guiding the generated gas generated in a furnace to the generated gas inlet. The product gas introduction port is provided on the upper side wall of the primary combustion chamber of the melting furnace, and is used for combustion supplied to the primary combustion chamber of the melting furnace at a location near the product gas introduction port in the gas duct. A first combustion air supply nozzle that supplies combustion air of 70% or more of the total amount of air is provided.

  The present invention also includes a gasification furnace for pyrolyzing waste to generate a product gas and a product gas inlet, and the pyrolysis gas in the product gas introduced from the product gas inlet is burned. In addition, a melting furnace for melting ash in the generated gas into a molten slag, the gasifying furnace and the melting furnace are connected, and the generated gas generated in the gasifying furnace is connected to the generated gas inlet. A method for supplying combustion air to a melting furnace of a gasification melting facility having a gas duct for guiding, wherein the generated gas inlet is provided on an upper side wall of a primary combustion chamber of the melting furnace, Of these, the first combustion air supply nozzle is provided in the vicinity of the product gas inlet, and the total amount of combustion air supplied from the first combustion air supply nozzle to the primary combustion chamber of the melting furnace. 70% or more of combustion air Which comprises feeding.

  In the gasification and melting facility and the method for supplying air for melting furnace combustion in the gasification and melting facility, the gas duct is provided with a portion near a generated gas inlet provided in an upper side wall of a primary combustion chamber of the melting furnace. 1 combustion air supply nozzle is provided, from which 70% or more of the combustion air supplied to the primary combustion chamber of the melting furnace is supplied from the gasification furnace. The generated gas and the combustion air from the first combustion air supply nozzle occupying most of the combustion air are mixed in a state where the heat generation amount of the generated gas introduced into the primary combustion chamber through the gas duct is high. Can be made. This makes it possible to prevent the clinker from adhering to the upper inner wall of the primary combustion chamber of the melting furnace by raising the temperature inside the primary combustion chamber of the melting furnace to be higher than the melting temperature of ash contained in the product gas. .

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an overall configuration of a gasification melting facility according to an embodiment of the present invention.

  The gasification and melting equipment 10 shown in FIGS. 1 to 5 includes a fluidized bed gasification furnace 20, a swirling flow melting furnace 30, and a gas duct 40. In the fluidized bed gasification furnace 20, a product gas B containing pyrolysis gas and char is generated by thermal decomposition of the waste A. The swirling flow melting furnace 30 has a product gas introduction port 33, and the product gas B from the fluidized bed gasification furnace 20 is introduced into the swirl flow melting furnace 30 from the product gas introduction port 33. In the swirl-flow melting furnace 30, the pyrolysis gas (combustible gas) in the product gas B burns, and the ash in the product gas B is melted into slag. The gas duct 40 connects the fluidized bed gasification furnace 20 and the swirling flow melting furnace 30, and introduces the generated gas B generated in the fluidized bed gasification furnace 20 into the swirling flow melting furnace 30. Guide to mouth 33.

  The swirling flow melting furnace 30 has a primary combustion chamber 31 and a secondary combustion chamber 32. The product gas B from the fluidized bed gasification furnace 20 is supplied to the primary combustion chamber 31 of the swirling flow melting furnace 30 through the gas duct 40 to form a swirling flow in the primary combustion chamber 31. The primary combustion chamber 31 has a ceiling wall, and a second combustion air supply nozzle 34 (one in the figure) is provided at the top thereof. The second combustion air supply nozzle 34 has a tip portion that opens, and blows combustion air f2 into the primary combustion chamber 31 from the tip portion.

  2 to 4 are views showing the main parts of the gas duct 40 and the swirling flow melting furnace 30, wherein FIG. 2 is a plan view, FIG. 3 is a side view taken along arrow III in FIG. 2, and FIG. It is IV arrow side view.

  As shown in FIG. 2, the product gas introduction port 33 is provided in the upper side wall of the primary combustion chamber 31 of the swirling flow melting furnace 30, and the gas duct 40 is connected to the product gas introduction port 33. A plurality (six in the figure) of first combustion air supply nozzles 41 a to 41 c and 42 a to 42 c are provided in a portion of the gas duct 40 near the product gas inlet 33. These first combustion air supply nozzles 41a to 41c, 42a to 42c have leading end portions that open, and blow combustion air f1 into the primary combustion chamber 31 from the leading end portions, and the generated gas B It is provided with the attitude | position inclined so that the flow direction of this may be followed (refer FIG. 2).

  More specifically, the first combustion air supply nozzles 41a to 41c are arranged one above the other on the side wall 43 on the outer side of the gas duct 40 (one gas duct side wall portion facing the duct width center line CL). It arrange | positions so that combustion air may be supplied from this outer side wall 43, inclining so that the flow direction of the said production | generation gas B may be followed. On the other hand, the first combustion air supply nozzles 42a to 42c are arranged vertically on the side wall 44 (the other gas duct side wall portion facing the duct width center line CL) inside the gas duct 40. It is arrange | positioned so that combustion air may be supplied from this inner side wall 44, inclining so that the flow direction of the said production | generation gas B may be followed.

  5 is a cross-sectional view taken along line VV in FIG. As shown in FIG. 5, the first combustion air supply nozzle 41a raises the furnace temperature (indoor temperature) above the primary combustion chamber 31, so that the gas duct in the vicinity of the product gas inlet 33 in a plan view. Combustion air f <b> 1 is blown toward the intersection position P <b> 1 between the 40 duct width center line CL and the product gas introduction port 33. That is, the position of the nozzle 41a is determined so that the extension line of the axis of the first combustion air supply nozzle 41a passes through the intersection position P1 in plan view.

  If the first combustion air supply nozzle 41a is provided so as to blow combustion air f1 toward a position upstream of the intersection position P1 (for example, position P2) in plan view, a gas duct is provided. There is a possibility that the temperature inside the gas 40 rises and the gas duct 40 is blocked by the clinker. Conversely, when the first combustion air supply nozzle 41a is provided so as to blow combustion air f1 toward a position downstream of the intersection position P1 (for example, position P3) in plan view, Since the combustion time until the product gas B mixed with the combustion air collides with the inner wall of the primary combustion chamber 31 is insufficient, it is difficult to obtain the effect of increasing the furnace temperature above the primary combustion chamber 31.

  Further, the first combustion air supply nozzle 41a is provided so as to blow combustion air f1 toward a position (for example, position P4) outside the duct width center line CL with respect to the intersection position P1 in plan view. In this case, since the combustion time until the product gas B mixed with the combustion air collides with the inner wall of the primary combustion chamber 31 is insufficient, there is an effect of increasing the furnace temperature above the primary combustion chamber 31. It is difficult to obtain. On the other hand, the first combustion air supply nozzle 41a is provided so as to blow combustion air f1 toward a position (for example, position P5) inside the duct width center line CL with respect to the intersection position P1 in plan view. If this is the case, the combustion air f <b> 1 may hinder the flow of the swirling flow in the primary combustion chamber 31, thereby reducing the slag conversion rate (ash content collection rate).

  Therefore, as described above, the first combustion air supply nozzle 41a is provided so as to blow the combustion air f1 toward the intersection position P1 between the duct width center line CL and the product gas introduction port 33 in plan view. It is preferable. This also applies to the other combustion air supply nozzles 41b, 41c and 42a to 42c. For this reason, the combustion air supply nozzles 41a to 41c according to this embodiment are provided on the gas duct side wall 43 outside the duct width center line CL, and are used for combustion from the side wall 43 toward the intersection point P1. On the other hand, the combustion air supply nozzles 42a to 42c are arranged on the gas duct side wall 44 inside the duct width center line CL, and are arranged for combustion from the side wall 44 toward the intersection point P1. It is arranged to blow air.

  Unlike the conventional melting furnace in which a plurality of combustion air supply nozzles are dispersedly provided in the upper part of the primary combustion chamber, the swirling flow melting furnace 30 is the primary of the swirling flow melting furnace 30 in the gasification melting facility 10. The first combustion air supply nozzles 41 a to 41 c and 42 a to 42 c provided in the gas duct 40 in the vicinity of the generated gas inlet 33 provided in the upper side wall of the combustion chamber 31, and the ceiling wall of the primary combustion chamber 31 are provided. Only the second combustion air supply nozzle 34 is configured to supply combustion air for the primary combustion chamber of the swirling flow melting furnace 30. The 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 by the second combustion air supply nozzle 34 is as described above. The first combustion air supply nozzles 41 a to 41 c and 42 a to 42 c are set so as to supply combustion air that is 70% or more of the total amount of combustion air supplied to the primary combustion chamber 31.

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

  As shown in FIG. 6, when the distribution ratio η is 46%, the measured value of the furnace temperature T is 1015 ° C. to 1149 ° C. (average value 1082 ° C.), and when the distribution ratio η is 63%, the furnace temperature T The actually measured values were 1154 ° C. to 1198 ° C. (average value 1176 ° C.), and when the distribution ratio η was 84%, the actually measured values of the furnace temperature T were 1165 ° C. to 1238 ° C. (average value 1201 ° C.). From this test result, it is concluded that if the distribution ratio η is 70% or more, the furnace temperature T in the upper part of the primary combustion chamber can be raised to exceed 1200 ° C. which is a temperature equal to or higher than the melting point of ash contained in the char. was gotten. That is, according to the result shown in FIG. 6, it was found that the distribution ratio η should be set to satisfy 70% or more.

  It should be noted that the amount of combustion air in the fluidized bed gasifier 20 (the amount of the pushing air E shown in FIG. 1), the first combustion air supply nozzles 41a to 41c, 42a to 42c, and the second combustion. The amount of combustion air for the primary combustion chamber supplied by the air supply nozzle 34 is the air ratio (the air ratio is the minimum amount of air required for complete combustion of the combustible material in the waste material. 1.0 to 1.2 is appropriate. This is to efficiently burn the product gas, which is a mixture of solid fuel and gas fuel, 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. . The flow rate of the combustion air for the primary combustion chamber supplied by the first and second combustion air supply nozzles is determined by the blower capacity and the piping design, but is relatively high, for example, 30 to 100 m / s. However, mixing of combustion air and product gas is promoted to increase combustion efficiency.

  Further, the supply speed of the product gas from the fluidized bed gasification furnace 20 to the swirling flow melting furnace 30 is preferably set to 15 to 25 m / s (more preferably 18 to 20 m / s). Although it is preferable that the supply speed of the product gas is high, if the pressure is too high, the collision pressure against the inner wall of the primary combustion chamber 31 of the swirling flow melting furnace 30 increases excessively and induces clinker adhesion. It is good to restrict to s.

  Next, a method for supplying air for melting furnace combustion in a gasification and melting facility using the gasification and melting facility 10 configured as described above will be described.

  In the fluidized bed gasification furnace 20, the pushing air E inserted from the bottom of the hearth causes the fluidized medium C such as sand to flow to form a fluidized bed. And the waste A thrown into this fluidized bed type gasification furnace 20 is thermally decomposed (gasified) in the said fluidized bed. Among the waste A, the non-combustible material D that is not gasified is discharged from the lower part of the fluidized bed to the outside of the furnace.

  The product gas (pyrolysis gas and char) B generated in the fluidized bed gasification furnace 20 is guided to the product gas inlet 33 of the swirling flow melting furnace 30 by the gas duct 40. The generated gas B is mixed with the combustion air f1 for the primary combustion chamber 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 generated gas introduction port 33. The product gas introduction port 33 is introduced into the primary combustion chamber 31 of the swirling flow melting furnace 30 to form a swirling flow in the primary combustion chamber 31, and further, a second provided on the ceiling wall of the primary combustion chamber 31. It is mixed with the combustion air f2 for the primary combustion chamber from the combustion air supply nozzle 34 and burned in the primary combustion chamber 31. At this time, when supplying the combustion air f1, f2 for the primary combustion chamber, the total amount of combustion air for the primary combustion chamber of the swirling flow melting furnace 30 by the first combustion air supply nozzles 41a-41c, 42a-42c. 70% or more, for example, 75% of the combustion air is supplied.

  In this method, the generated gas B introduced from the fluidized bed gasifier 20 to the primary combustion chamber 31 by the gas duct 40 has a high calorific value, and the generated gas B and the first amount occupying most of the combustion air. The combustion air f1 produced by the combustion air supply nozzles 41a to 41c and 42a to 42c is mixed, and the product gas B can be burned at once. This makes it possible to prevent the clinker from adhering to the upper inner wall of the primary combustion chamber 31 by increasing the furnace temperature above the primary combustion chamber 31 to a melting temperature of 1200 ° C. or higher in the ash contained in the char.

  The melted ash flows down along the inner wall of the primary combustion chamber 31, flows down the swirl flow melting furnace bottom (slag separation unit) together with the ash melted at the lower portion of the primary combustion chamber 31, and passes through the slag outlet 35. The molten slag H is discharged to the outside. Further, the product gas introduced from the primary combustion chamber 31 to the secondary combustion chamber 32 is mixed with the combustion air G for the secondary combustion chamber in the secondary combustion chamber 32 and completely burned. The combustion exhaust gas J after being completely burned in the secondary combustion chamber 32 is discharged from the swirling flow melting furnace 30, passes through a heat recovery device, a bag filter, and the like, and then is released into the atmosphere.

  Thus, according to the method for supplying air for melting furnace combustion in the gasification melting facility according to the present invention, it is possible to prevent clinker from adhering to the upper inner wall of the primary combustion chamber 31 of the swirling flow melting furnace 30. Accordingly, the swirling flow melting furnace 30 is prevented from being damaged and the slag outlet 35 is blocked by the clinker dropping, the primary combustion chamber 31 is prevented from being blocked by the clinker growth, and the clinker is attached and grown. It is possible to prevent a decrease in combustion efficiency and a decrease in the slag rate, and as a result, it is possible to perform a stable operation of the gasification melting facility 10 in an appropriate state for a long period of time.

  That is, according to the gasification and melting equipment and the gas supply and melting method of the gasification and melting equipment according to the present invention, the gas duct in the vicinity of the product gas inlet provided on the upper side wall of the primary combustion chamber of the melting furnace is provided. The gasification furnace is provided with a first combustion air supply nozzle and 70% or more of the combustion air supplied from the nozzle to the primary combustion chamber of the melting furnace is supplied. The generated gas and the combustion air from the first combustion air supply nozzle occupying most of the total amount of combustion air in a state where the heat generation amount of the generated gas introduced into the primary combustion chamber through the gas duct is high This makes it possible to increase the temperature in the upper part of the primary combustion chamber of the melting furnace to be higher than the melting temperature of the ash contained in the product gas, and to clean the upper inner wall of the primary combustion chamber of the melting furnace. It makes it possible to prevent adhesion. This means that the melting furnace is prevented from being damaged and the slag outlet is blocked due to the clinker falling, the primary combustion chamber from being blocked due to the clinker growth, and the combustion efficiency is reduced due to the adhesion and growth of the clinker. It is possible to prevent a reduction in the slag rate, and as a result, it is possible to perform a stable operation in an appropriate state of the gasification melting equipment for a long period of time.

  Here, the first combustion air supply nozzle blows combustion air toward the intersection of the duct width center line of the gas duct and the product gas introduction port in the vicinity of the product gas introduction port in a plan view. It is more preferable that they are provided. This means that the combustion time until the generated gas containing the combustion air collides with the inner wall of the primary combustion chamber is secured while preventing the temperature of the gas duct from rising and clogging with the clinker. It is possible to increase the temperature in the furnace at the top of the chamber.

  In this case, the first combustion air supply nozzle is provided in the gas duct in a posture in which combustion air is blown toward the intersection position while inclining along the duct width center line. More preferred. This enables a smooth supply of combustion air from the nozzle into the primary combustion chamber.

  Further, the first combustion air supply nozzle includes a nozzle that is provided on a gas duct side wall outside the duct width center line and blows combustion air from the side wall toward the intersection point, and the duct width center. More preferably, a nozzle provided on the side wall of the gas duct inside the line and injecting combustion air from the side wall toward the intersection point is more preferable. 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, each of the first combustion air supply nozzles is provided so as to supply combustion air while being inclined along the duct width center line, so that the combustion air supplied from the outer side wall and the inner side There are few elements that interfere with the combustion air supplied from the side walls of the cylinder.

  Further, in the present invention, the primary combustion chamber of the melting furnace is constituted only 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. Combustion air may be supplied.

It is a figure showing the whole gasification melting equipment composition concerning one embodiment of the present invention. It is a top view which shows the principal part of the gas duct in FIG. 1, and a swirling flow melting furnace. FIG. 3 is a side view taken along the arrow III in FIG. 2. It is IV arrow side view of FIG. It is the VV sectional view taken on the line of FIG. The distribution ratio η of the combustion air supply amount by the first combustion air supply nozzle provided in the gas duct to the total amount of combustion air for the primary combustion chamber for the swirling flow melting furnace, and the furnace temperature T in the upper part of the primary combustion chamber It is a graph which shows a relationship. It is a top view which shows the mode of adhesion of the clinker to the upper inner wall of the primary combustion chamber of a swirling flow melting furnace. It is a side view which shows the mode of adhesion of the clinker to the upper inner wall of the primary combustion chamber of a swirling flow melting furnace.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Gasification melting equipment 20 ... Fluidized bed type gasification furnace 30 ... Swirling flow melting furnace 31 ... Primary combustion chamber 32 ... Secondary combustion chamber 33 ... Generated gas inlet 34 ... Second combustion air supply nozzle 35 ... Slag Outlet 40 ... Gas duct 41a-41c, 42a-42c ... First combustion air supply nozzle 43, 44 ... Gas duct side wall A ... Waste B ... Generated gas C ... Fluid medium D ... Non-combustible material E ... Pushed air f1, f2 ... Combustion air for primary combustion chamber G ... Combustion air for secondary combustion chamber H ... Molten slag J ... Combustion exhaust gas

Claims (10)

Gasification and melting equipment,
A gasifier that pyrolyzes waste to produce product gas;
A melting furnace having a product gas inlet, burning the pyrolysis gas in the product gas introduced from the product gas inlet, and slagging the ash in the product gas;
A gas duct that connects the gasification furnace and the melting furnace and guides the product gas generated in the gasification furnace to the product gas inlet;
The product gas inlet is provided on the upper side wall of the primary combustion chamber of the melting furnace,
A first combustion air supply nozzle that supplies combustion air that is 70% or more of the total amount of combustion air supplied to the primary combustion chamber of the melting furnace to a portion near the product gas inlet in the gas duct. Provided,
Gasification and melting equipment.   The first combustion air supply nozzle is provided so as to blow combustion air toward an intersection point between a duct width center line of the gas duct and the generated gas inlet in the vicinity of the generated gas inlet in a plan view. The gasification and melting equipment according to claim 1, wherein   3. The gas according to claim 2, wherein the first combustion air supply nozzle is provided in the gas duct in a posture in which combustion air is blown toward the intersection point while inclining along the duct width center line. Chemical melting equipment.   The first combustion air supply nozzle is provided on a gas duct side wall outside the duct width center line, and a nozzle for blowing combustion air from the side wall toward the intersection position, and the duct width center line 4. The gasification and melting equipment according to claim 3, further comprising a nozzle that is provided on a side wall of the inner gas duct and blows in combustion air from the side wall toward the intersection position.   A second combustion air supply nozzle is provided on the ceiling wall of the primary combustion chamber of the melting furnace, and the first combustion chamber is used for combustion in the primary combustion chamber of the melting furnace only by the first and second combustion air supply nozzles. The gasification melting equipment according to any one of claims 1 to 4, wherein air is supplied. A gasification furnace for pyrolyzing waste to generate a product gas, and a product gas introduction port, the pyrolysis gas in the product gas introduced from the product gas introduction port is combusted, and the product gas A melting furnace for melting ash in the melt, and a gas duct connecting the gasification furnace and the melting furnace and guiding the generated gas generated in the gasification furnace to the generated gas inlet. A method for supplying combustion air to a melting furnace of a gasification melting facility,
Providing the product gas inlet on the upper side wall 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;
Including supplying 70% or more of combustion air from the first combustion air supply nozzle to 70% or more of the total amount of combustion air supplied to the primary combustion chamber of the melting furnace,
An air supply method for combustion in a melting furnace of a gasification melting facility.   Combustion air is blown by the first combustion air supply nozzle toward the intersection of the duct width center line of the gas duct and the product gas inlet in the vicinity of the product gas inlet in plan view. Item 7. A method for supplying air for melting furnace combustion in a gasification melting facility according to Item 6.   The gasification and melting according to claim 7, wherein the first combustion air supply nozzle is provided in the gas duct in a posture in which combustion air is blown toward the intersection point while inclining along the duct width center line. Method of supplying air for melting furnace combustion of equipment.   The first combustion air supply nozzle is provided on a gas duct side wall outside the duct width center line, and a nozzle for blowing combustion air from the side wall toward the intersection position, and the duct width center line And a nozzle for injecting combustion air from the side wall toward the intersection position. The method for supplying air for combustion in a melting furnace of a gasification and melting facility.   Furthermore, a second combustion air supply nozzle is provided on the ceiling wall of the primary combustion chamber of the melting furnace, and the primary combustion of the melting furnace is performed only by the first and second combustion air supply nozzles. The method for supplying air for combustion in a melting furnace of a gasification melting facility according to any one of claims 6 to 9, wherein combustion air for the chamber is supplied.

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