JP6460848B2 - Operation method of melting furnace - Google Patents

Description

  The present invention relates to a method for operating a melting furnace.

  Conventionally, a melting furnace is known in which combustible gas generated in a gasification furnace is combusted and ash contained in the combustible gas is melted. The melting furnace may be supplied with crushed non-combustible materials discharged from the gasification furnace. In this case, the incombustible material is also melted in a melting furnace to form slag. In such a melting furnace, slag tends to adhere to various locations in the melting furnace during operation of the melting furnace.

For example, in Patent Document 1, a combustion chamber having an inflow port and combusting combustible gas flowing in through the inflow port, and a discharge for discharging molten slag formed by melting ash contained in the combustible gas are disclosed. In a melting furnace having a shed and a gas discharge chamber for discharging exhaust gas after burning in the combustion chamber, slag is likely to adhere to the inner surface of the combustion chamber and the inner surface of the gas discharge chamber, and It is disclosed that the melting of the slag is promoted by adjusting the basicity (CaO / SiO ₂ ). This Patent Document 1 includes a component capable of adjusting the basicity of the upstream slag because the basicity of the upstream slag adhering to the combustion chamber and the basicity of the downstream slag adhering to the gas discharge chamber are different from each other. It is disclosed that a first basicity adjusting agent and a second basicity adjusting agent containing a component capable of adjusting the basicity of the downstream slag are supplied. Specifically, the melting furnace described in Patent Document 1 supplies a first supply unit capable of supplying the first basicity adjusting agent to the upstream slag and the second basicity adjusting agent to the downstream slag. A possible second supply section. The first supply unit supplies the first basicity adjuster into the combustion chamber through the inflow port. The second supply unit supplies the second basicity adjusting agent into the gas discharge chamber from above the tap outlet.

JP 2009-014334 A

  In the operation method of the melting furnace described in the above-mentioned Patent Document 1, in order to adjust the basicity of the upstream slag, the first basicity adjusting agent is supplied through the inlet by the first supply unit, and the downstream slag base In order to adjust the degree, the second supply unit supplies the second basicity adjusting agent from above the outlet, but it is difficult to uniformly adjust the basicity of these slags.

  The objective of this invention is providing the operating method of the melting furnace which can adjust effectively the basicity of the slag adhering in a melting furnace.

  As a result of intensive studies to solve the above problems, the present inventors have found that the ash and incombustible slag formations (discharged from the gasification furnace) flowed into the melting furnace through the inlet. (Where slag is formed by melting) is attached to the melting furnace approximately depending on the particle size of the slag product, and there is a correlation between the particle size and basicity of the slag product. I found out.

  Therefore, the present inventors adjust the particle size and the component of the basicity adjusting agent based on the correlation observed between the particle size and basicity of the slag formation product, and the basicity adjusting agent is added to the slag through the inlet. It was conceived that the basicity of the slag adhering to the melting furnace can be kept within a predetermined range by supplying it into the melting furnace together with the formed product.

The present invention has been made from such a viewpoint, and has an inlet that allows inflow of a combustible gas generated in a gasification furnace and a slag formation product that forms slag by melting, and has flowed in through the inlet. A method of operating a melting furnace including a furnace main body for burning a combustible gas and melting the slag formation product, wherein a plurality of particle size regions each having a specific particle size range are set as the slag formation product And a slag adhering in the furnace body, and a melting step of melting the slag formation by burning the combustible gas in the furnace body A basic agent for adjusting the basicity of the furnace, and a regulator supplying step for supplying the basicity regulator into the furnace body. In the regulator supplying step, the basicity regulator Thus, the basicity of the slag formed by melting the slag forming material belonging to each region having a particle size within the range of the particle size set for each particle size region may fall within a predetermined range. A plurality of types of region-specific adjusting agents containing possible components are supplied into the furnace body through the inlet , and the plurality of types of region-based adjusting agents have a higher basicity than the predetermined range. A first region-specific regulator comprising a component capable of lowering the basicity of the slag formed by melting and having a particle size within the range of the particle size set in the particle size region of the slag formed product; , Including a component capable of increasing the basicity of the slag formed by melting the slag formation having a basicity lower than the predetermined range, and the particle size set in the particle size region of the slag formation The second region having a particle size in the range of Including a separate modifier, it provides a method of operating a melting furnace.

  In this method, as the basicity adjusting agent, the basicity of the slag formed by melting the slag formers each having a particle size within the range of the particle size set for each particle size region. Since a plurality of types of region-specific modifiers containing components that can fall within a predetermined range flow into the furnace body together with the slag formation through the inlet, it is formed by melting the slag formation belonging to each particle size region. Therefore, the basicity of each slag adhering to the inside of the furnace body falls within a predetermined range. Specifically, since both the slag former and the basicity adjuster flow into the furnace body through the inlet, the particle size range set in a specific particle size region of the slag former and the basicity modifier. Those having an inner particle size adhere to substantially the same region in the furnace body. And the basicity adjusting agent having a particle size within the range of the particle size set in the specific particle size region, the basicity of the slag formed by melting of the slag forming material belonging to the specific particle size region Since a component that can be included in the predetermined range is included, the basicity of the slag is approximately within the predetermined range. Therefore, the basicity of each slag adhering to the adhesion location according to each particle size region within the furnace body is effectively adjusted.

  In this case, in the melting step, among the slag forming products, among the incombustible materials discharged from the gasification furnace, slag is formed by melting, and two or more particle sizes of the plurality of particle size regions are formed. Those belonging to the incombustible material region group including the region are allowed to flow into the furnace body through the inlet, and in the adjusting agent supply step, each of the plurality of types of adjusting agents by region is added to the incombustible material region group. A component having a particle size within the range of the particle size set for each particle size region to which it belongs and capable of keeping the basicity of the slag formed by melting the incombustible material belonging to the region within the predetermined range. It is preferable to supply what is contained in the furnace body through the inlet.

  If it does in this way, the thing which forms slag by melting among the incombustibles discharged from the gasification furnace is melted in the melting furnace, and the adhesion of the slag formed by the melting into the furnace body is suppressed. Can do.

  Moreover, in this invention, it is an ash content contained in the said combustible gas among the said slag formation products in the said melting process, Comprising: It belongs to the ash content area | region group which consists of a 2 or more particle size area | region among these several particle size area | regions. In the furnace body through the inlet, and in the adjusting agent supplying step, each of the plurality of types of region-specific adjusting agents is set to each particle size region belonging to the ash region group. A furnace body containing a component having a particle size within the range of particle size and containing a component capable of keeping the basicity of slag formed by melting ash belonging to the region within the predetermined range. It is preferable to supply inside.

  If it does in this way, adhesion of the slag formed by this melting in the furnace body can be controlled, melting the ash which flows into the melting furnace from the gasification furnace in the melting furnace.

  In this case, in the melting step, the slag formation product is ash contained in the combustible gas, which belongs to the ash region group, and ash discharged from equipment different from the gasifier. The particles belonging to the ash region group are allowed to flow into the furnace body through the inlet, and in the adjusting agent supply step, each of the plurality of types of region-specific adjusting agents belongs to the ash region group. The one having a particle size within the range of the particle size set in the diameter region and containing a component capable of keeping the basicity of the slag formed by melting the ash belonging to the region within the predetermined range, It is preferable to supply into the furnace body through the inlet.

  By doing this, in addition to the ash generated in the gasification furnace, the ash discharged from the equipment different from the gasification furnace (stoker furnace, etc.) is melted in the melting furnace, and the slag furnace body formed by this melting Adhesion to the inside can be suppressed.

  Further, in the present invention, as the furnace main body, the inflow of non-combustible material discharged from at least one of the gasification furnace and the facility different from the gasification furnace as the slag forming material by melting is allowed. In the melting step, the slag formation product is an ash contained in the combustible gas and includes two or more particle size regions of the plurality of particle size regions. While flowing into the furnace body through the inflow port, those belonging to the ash region group, and forming slag by melting of the incombustible material among the slag forming material, and among the plurality of particle size regions Those that belong to the incombustible material region group including two or more particle size regions are caused to flow into the furnace body through the supply port. Among the agents, the basicity of slag having a particle size within the range of the particle size set for each particle size region belonging to the ash region group and the slag formed by melting of the ash belonging to the region is Each of the particle sizes belonging to the incombustible material region group among the plurality of region-specific adjusting agents is supplied into the furnace body through the inflow port, containing a component that can fall within a predetermined range. The one having a particle size within the range of the particle size set in the region and containing a component capable of keeping the basicity of the slag formed by melting the incombustible material belonging to the region within the predetermined range, It is preferable to supply into the furnace body through the supply port.

  In this way, in addition to the ash generated in the gasification furnace, incombustibles discharged from at least one of the gasification furnace and the facility different from the gasification furnace are melted in the melting furnace and formed by this melting. Slag adhesion to the furnace body can be suppressed.

  As described above, according to the present invention, it is possible to provide a method for operating a melting furnace capable of effectively adjusting the basicity of slag adhering to the melting furnace.

It is a figure which shows the outline of the gas melting furnace of 1st Embodiment of this invention. It is a figure which shows the relationship between the particle size of ash content, and basicity. It is a figure which shows the relationship between the particle size and basicity of an incombustible material. It is a figure which shows the outline of the gas melting furnace of 2nd Embodiment of this invention.

  Preferred embodiments of the present invention will be described below with reference to the drawings.

(First embodiment)
A gasification melting furnace according to a first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIG. 1, the gasification melting furnace of this embodiment includes a gasification furnace 10 and a melting furnace 15.

  The gasification furnace 10 is a furnace that takes out combustible gas from the waste by heating the waste. In the present embodiment, a fluidized bed gasifier is used as the gasifier 10. Specifically, the fluidized bed gasification furnace is a furnace that takes out combustible gas from the waste by heating the waste in a fluidized bed formed by fluidizing the fluidized medium with the fluidized gas. . The combustible gas generated in the gasification furnace 10 flows into the melting furnace 15 through a duct 40 connecting the gasification furnace 10 and the melting furnace 15.

  The combustible gas contains ash. This ash has various particle sizes. Further, the basicity of the ash varies depending on the particle size of the ash. An example is shown in FIG. As shown in FIG. 2, the ash was divided into those belonging to the first particle size region A1 having a particle size of less than 50 μm and those belonging to the second particle size region A2 having a particle size of 50 μm or more. In this case, the basicity of ash belonging to the first particle size region A1 was 1.5, and the basicity of ash belonging to the second particle size region A2 was 0.5. Each basicity is measured by obtaining ash from the duct 40. This measurement is performed every specific period (for example, every quarter). Note that these values vary depending on the waste put into the gasification furnace 10.

In the present embodiment, the particle size of the ash is measured by a laser diffraction / scattering method. Further, “basicity” refers to a numerical value represented by CaO / SiO ₂ . That is, the basicity increases with the addition of calcium carbonate or the like, and decreases with the addition of silica or glass. For this reason, when the basicity is low, calcium carbonate or the like is added. Conversely, when the basicity is high, silica or glass is added.

  In the present embodiment, a part of the incombustible material discharged from the gasification furnace 10 that forms slag by melting is crushed by a crusher or the like as necessary, and then the inside of the melting furnace 15 through the duct 40 To be supplied. This incombustible has various particle sizes. The basicity of the incombustible material also varies depending on the particle size of the incombustible material. As shown in FIG. 3, the incombustible material is classified into a third particle size region A3 having a particle size of less than 0.5 mm, and a fourth particle size having a particle size of 0.5 mm or more and 1.0 mm or less. When divided into those belonging to the region A4 and those belonging to the fifth particle size region A5 having a particle size larger than 1.0 mm, the basicity of the incombustible material belonging to the third particle size region A3 is 0. 71, the basicity of the incombustible material belonging to the fourth particle size region A4 was 0.24, and the basicity of the incombustible material belonging to the fifth particle size region A5 was 0.17. These basicities can be measured by sampling after crushing (pulverizing) the incombustible material. The basicity is also measured every predetermined period.

  Hereinafter, a plurality of particle size regions (first particle size region A1 and second particle size region A2) to which ash belongs are referred to as “ash content region group”, and a plurality of particle size regions (third particle size region A3) to which incombustibles belong. To the fifth particle size region A5) are referred to as “incombustible material region group”.

  The melting furnace 15 is a furnace for melting the ash contained in the combustible gas by burning the combustible gas generated in the gasification furnace 10. In the present embodiment, the incombustible material is also melted together with the ash in the melting furnace 15. That is, the ash and the non-combustible material constitute a “slag forming material” that forms slag by melting. In the present embodiment, a swirling flow melting furnace is used as the melting furnace 15. The melting furnace 15 includes a furnace body 20 and a basicity adjusting agent supply unit 30. The furnace body 20 includes a combustion chamber 21, a tap outlet 20 b, and a gas discharge chamber 26.

  The combustion chamber 21 has an inflow port 21a that allows the inflow of combustible gas and the slag formation, and combusts the swirling combustible gas that has flowed in through the inflow port 21a. Combustion air for burning the combustible gas is supplied to the combustion chamber 21. The combustion chamber 21 has a shape extending in the vertical direction. In the present embodiment, the combustion chamber 21 includes an upstream combustion chamber 22 having an inlet 21a, a downstream combustion chamber 23 disposed below the upstream combustion chamber 22, an upstream combustion chamber 22 and a downstream combustion chamber. 23, and a diaphragm 24 provided at the boundary with the head 23.

  The upstream combustion chamber 22 is formed in a cylindrical shape, and is arranged in a posture in which the central axis is parallel to the vertical. The inlet 21 a is formed in the upper part of the upstream combustion chamber 22. The duct 40 is connected to a portion of the upstream combustion chamber 22 surrounding the inflow port 21a. The duct 40 is connected to the upstream combustion chamber 22 in such a posture that a combustible gas flowing into the upstream combustion chamber 22 through the inflow port 21 a forms a swirling flow that swirls along the inner peripheral surface of the upstream combustion chamber 22. Has been. Specifically, the duct 40 is configured to allow the combustible gas to flow into the upstream combustion chamber 22 from the inflow port 21 a toward a direction (tangential direction) different from the center of the upstream combustion chamber 22. It is connected to the.

  The downstream combustion chamber 23 has a bottom wall 23a having a shape extending obliquely downward from the lower portion of the throttle portion 24 toward the tap outlet 20b. The molten slag formed by melting the slag formation (the ash and the incombustible material) during combustion of the combustible gas in the combustion chamber 21 flows down on the bottom wall 23a and is discharged from the outlet 20b. The The throttle portion 24 has an inner diameter that is smaller than the inner diameter of the lower end portion of the upstream combustion chamber 22.

  The gas discharge chamber 26 is provided on the downstream side of the combustion chamber 21 and above the outlet 20b, and has a shape for discharging the exhaust gas after burning in the combustion chamber 21. The gas discharge chamber 26 is disposed on the opposite side (the right side in FIG. 1) of the combustion chamber 21 with respect to the tap outlet 20b. The gas discharge chamber 26 has a shape surrounding a space extending obliquely upward from the tap outlet 20b. The gas discharge chamber 26 has a bottom wall 27 having a shape that inclines upward as it is separated from the tap hole 20b.

The basicity adjusting agent supply unit 30 supplies a basicity adjusting agent capable of adjusting the basicity of the slag S attached in the furnace body 20. Specifically, the basicity adjusting agent supply unit 30 supplies a plurality of types of region-specific adjusting agents as the basicity adjusting agent into the combustion chamber 21 through the inlet 21a. Each region-specific regulator has a particle size (50% particle size in the present embodiment) within the range of the particle size set in one of the plurality of particle size regions, and It contains a component capable of keeping the basicity of the slag formed by melting the slag former belonging to the region within a predetermined range (for example, 0.6 to 0.9). The 50% particle diameter (median diameter) is the particle diameter when the cumulative particle ratio in the cumulative distribution (volume distribution) table is 50%. Each region-specific regulator has a 50% particle size (hereinafter, simply referred to as “particle size”) and at least one of different components. In the present embodiment, the plurality of types of region-specific regulators correspond to each of a plurality of particle size regions (first particle size region A1 and second particle size region A2) belonging to the ash content region group, Corresponding to each of a plurality of particle size regions (third particle size region A3 to fifth particle size region A5) belonging to the incombustible material region group. For example, as shown in FIG. 2, the relationship between the first particle size region A1 and the second particle size region A2 and the basicity of each ash belonging to these regions has been obtained in advance, as shown in FIG. In addition, when the relationship between the third particle size region A3 to the fifth particle size region A5 and the basicity of each incombustible material belonging to these regions is obtained in advance, the basicity adjusting agent supply unit 30 adjusts the basicity. As the agent, five types of region-specific adjusting agents (first region-specific adjusting agent to fifth region-specific adjusting agent) are supplied. The first region-specific adjusting agent has a particle size within the range of the particle size set in the first particle size region A1 (less than 50 μm), and the slag formed by melting of ash belonging to the region. A component (such as SiO ₂ ) that can lower the basicity is included. The second region-specific adjusting agent has a particle size within the range of the particle size set in the second particle size region A2 (50 μm or more), and is a slag formed by melting ash belonging to the region. Contains a component capable of increasing basicity (such as CaCO ₃ ). Since the ash generated in the gasification furnace 10 has a particle size of 350 μm or more but the amount of scattering to the melting furnace 15 is very small, the upper limit value of the particle size of the second region-specific adjusting agent is set to 350 μm. May be. The fourth region-specific regulator has a particle size within the range of the particle size set in the fourth particle size region A4 (0.5 mm to 1.0 mm), and is an incombustible material belonging to the region. It contains a component capable of increasing the basicity of the slag formed by melting. The fifth region-specific regulator has a particle size within the range of the particle size set in the fifth particle size region A5 (range larger than 1.0 mm), and melts incombustibles belonging to the region. The component which can raise the basicity of the slag formed by this is included. Since the basicity of the incombustible material belonging to the third particle size region A3 is within the predetermined range (0.71 in the present embodiment), the basicity of the slag formed by melting the incombustible material belonging to the region is determined. The supply of the third region-specific adjusting agent containing an adjustable component may be omitted. The particle size of the basicity adjusting agent may be adjusted according to the specific gravity of each of ash, noncombustible material, and basicity adjusting agent. In the present embodiment, the basicity adjusting agent supply unit 30 is connected in the duct 40.

  Next, the operation method of the gasification melting furnace of this embodiment is demonstrated.

  First, waste is thrown into the gasifier 10. Then, combustible gas generated in the gasification furnace 10 flows into the melting furnace 15 through the duct 40. On the other hand, some of the incombustibles discharged from the gasification furnace 10 and forming slag by melting are also processed into a melting furnace 15 through a duct 40 after being processed by a crusher or pulverizer (not shown). The

  The combustible gas that has flowed into the combustion chamber 21 through the inflow port 21a burns while swirling in the combustion chamber 21, thereby melting the slag formation (the ash and the incombustible material). The molten slag formed by melting the slag formation material flows down on the bottom wall 23a of the downstream combustion chamber 23 and is discharged from the tap outlet 20b. On the other hand, the exhaust gas after burning in the combustion chamber 21 goes to the equipment on the downstream side of the melting furnace 15 through the gas discharge chamber 26.

  Here, during the operation of the gasification melting furnace, as shown in FIG. 1, since slag S may adhere in the furnace body 20 of the melting furnace 15, the basicity adjustment from the basicity adjusting agent supply unit 30. As the agent, the plural kinds of region-specific adjusting agents (first region-specific adjusting agent to fifth region-specific adjusting agent) are supplied.

  If it does so, both slag formation (ash and incombustible) and each area | region adjusting agent will flow in in the furnace main body 20 through the inflow port 21a. For this reason, among the slag forming product and the regulators for each region, those having a particle size within the range of the particle size set in the same particle size region adhere to almost the same region in the furnace body 20. Specifically, those having a relatively large particle size (for example, those belonging to the fourth particle size region A4 and the fifth particle size region A5) among the slag formation products and the regulators for each region have a large centrifugal force in the combustion chamber 21. Those having a relatively small particle size (for example, those belonging to the first particle size region A1) that are easily attached to the combustion chamber 21 while swirling under the influence of the force are scattered up to the gas discharge chamber 26 and the gas discharge chamber. 26 easily adheres. The region-specific regulator having a particle size within the range of the particle size set for each particle size region keeps the basicity of the slag formed by melting the slag forming material belonging to the particle size region within a predetermined range. Therefore, the basicity of the slag S falls within a predetermined range. Therefore, the basicity of each slag S adhering to the adhesion location according to each particle size region in the furnace body 20 is effectively adjusted.

(Second Embodiment)
A gasification melting furnace according to a second embodiment of the present invention will be described with reference to FIG. In the second embodiment, only parts different from the first embodiment will be described, and the description of the same structure, operation, and effect as in the first embodiment will be omitted.

  The furnace body 20 of the melting furnace 15 of the present embodiment has a supply port 21b that allows inflow of nonflammable materials that form slag by melting, in addition to the inflow port 21a. The supply port 21 b is formed at the top of the furnace body 20. However, the formation position of the supply port 21b is not limited to the top. The incombustible material discharged from at least one of the gasification furnace 10 and the facility different from the gasification furnace 10 is supplied into the furnace body 20 through the supply port 21b. The incombustibles discharged from the gasification furnace 10 and the facility are crushed by a crusher or the like before being supplied to the furnace body 20 so as to be distributed in the third particle size region A3 to the fifth particle size region A5. . In addition, examples of the non-combustible material discharged from the facility include digging dust that has been dug from a landfill.

  The basicity adjusting agent supply unit 30 supplies the first region-specific adjusting agent and the second region-specific adjusting agent through the inflow port 21a, and supplies the third region-specific adjusting agent to the fifth region-specific adjusting agent through the supply port 21b. To do.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  The basicity adjusting agent supplied by the basicity adjusting agent supply unit 30 is not limited to the above embodiment. For example, the basicity adjusting agent supply unit 30 may supply only the first region-specific adjusting agent and the second region-specific adjusting agent including a component capable of adjusting the basicity of slag formed by melting ash. Alternatively, the basicity adjusting agent supply unit 30 may supply only the third region-specific adjusting agent to the fifth region-specific adjusting agent including a component capable of adjusting the basicity of the slag formed by melting the incombustible material. .

  In the above embodiment, the ash is divided into those belonging to the first particle size region A1 and those belonging to the second particle size region A2, and from the basicity adjusting agent supply unit 30 to the particle size regions A1, A2. Although the example which supplies the adjustment agent according to a corresponding area | region was shown, the ash content is divided into what belongs to a particle size area of 3 or more, and the adjustment agent according to each particle diameter area from the basicity adjustment agent supply part 30 is divided. You may supply. Similarly, the incombustible material may be divided into those belonging to two or four or more particle size regions, and the region-based adjusting agent corresponding to each particle size region may be supplied from the basicity adjusting agent supply unit 30.

  Further, ash content discharged from equipment different from the gasification furnace 10 (stoker furnace or the like) and belonging to the ash content group may be supplied into the furnace body 20 through the inlet 21a. Or you may supply this ash content in the furnace main body 20 through the supply port 21b. In this case, the region-specific adjusting agent corresponding to the particle size region to which the ash belongs is supplied from the basicity adjusting agent supply unit 30 through the supply port 21b.

  Moreover, the supply of the incombustible material to the melting furnace 15 may be omitted. In this case, the supply of the third region-specific adjusting agent to the fifth region-specific adjusting agent from the basicity adjusting agent supplying unit 30 is omitted.

  Further, the incombustible material may be finely pulverized so as to be distributed in the first particle size region A1 and the second particle size region A2, for example, and the pulverized material may be supplied to the gasification furnace 10. In this way, the pulverized material flows into the furnace body 20 through the inflow port 21 a together with the combustible gas and ash generated in the gasification furnace 10. Therefore, also in this case, the supply of the third region-specific adjusting agent to the fifth region-specific adjusting agent from the basicity adjusting agent supplying unit 30 is omitted.

  The particle size of the basicity adjusting agent is not limited to 50% particle size. A so-called mode diameter may be employed as the particle diameter. Even in this case, the same effect as described above can be obtained.

  Further, the connection destination of the basicity adjusting agent supply unit 30 is not limited to the duct 40. The connection destination of the basicity adjusting agent supply unit 30 can be set in a range in which the basicity adjusting agent is supplied into the furnace body 20 through the inflow port 21a. For example, the basicity adjusting agent supply unit 30 may be connected to a portion of the combustion chamber 21 that surrounds the inflow port 21 a or may be connected to the gasification furnace 10.

  Further, the shape of the furnace body 20 of the melting furnace 15 is not limited to the example of the above embodiment. For example, the combustion chamber 21 and the tap hole 20b may have a shape that overlaps in the vertical direction, or the gas discharge chamber 26 and the tap hole 20b may overlap in the vertical direction. Further, the bottom wall 27 of the gas discharge chamber 26 is not limited to a shape that is inclined so as to go upward as it goes downstream.

DESCRIPTION OF SYMBOLS 10 Gasification furnace 15 Melting furnace 20 Furnace main body 20b Outlet 21 Combustion chamber 21a Inlet 21b Supply port 26 Gas discharge chamber 30 Basicity regulator supply part 40 Duct S Slag

Claims (5)

A combustible gas generated in the gasification furnace and an inflow port that allows inflow of a slag formation product that forms slag by melting, and combusts the combustible gas that flows in through the inflow port and melts the slag formation product. A method of operating a melting furnace including a furnace body,
As the slag formation product, those distributed in a plurality of particle size regions each having a specific particle size range are caused to flow into the furnace body through the inlet, and the combustible gas is allowed to flow in the furnace body. A melting step of melting the slag formation by burning,
A regulator supply step of supplying a basicity adjusting agent capable of adjusting the basicity of the slag adhering in the furnace body into the furnace body, and
In the adjusting agent supply step, each of the basicity adjusting agents is formed by melting a slag formation product having a particle size within the range of the particle size set for each particle size region and belonging to the region. A plurality of types of region-specific adjusting agents containing components capable of keeping the basicity of slag within a predetermined range are supplied into the furnace body through the inlet .
The plural kinds of region-specific regulators are:
It includes a component capable of lowering the basicity of the slag formed by melting the slag former having a higher basicity than the predetermined range, and has a particle size set in the particle size region of the slag former. A first region-specific regulator having a particle size in the range;
A component capable of increasing the basicity of the slag formed by melting the slag former having a basicity lower than the predetermined range, and having a particle size set in the particle size region of the slag former. And a second region-specific conditioner having a particle size in a range . In the operation method of the melting furnace according to claim 1,
In the melting step, the non-combustible material that forms slag by melting among the non-combustible materials discharged from the gasification furnace, and includes two or more particle size regions of the plurality of particle size regions. The thing belonging to the object region group flows into the furnace body through the inlet,
In the adjusting agent supply step, among the plurality of types of region-specific adjusting agents, each has a particle size within a range of particle sizes set in each particle size region belonging to the incombustible material region group, and the region A method for operating a melting furnace, comprising supplying a component containing a component capable of keeping the basicity of a slag formed by melting an incombustible material within the predetermined range into the furnace body through the inflow port. In the operation method of the melting furnace according to claim 1 or 2,
In the melting step, among the slag formations, ash contained in the combustible gas, and belonging to an ash region group consisting of two or more particle size regions of the plurality of particle size regions, the inflow port Through the furnace body,
In the adjusting agent supplying step, among the plurality of types of region-specific adjusting agents, each has a particle size within a range of particle sizes set in each particle size region belonging to the ash region group and in the region A method for operating a melting furnace, comprising supplying a component containing a component capable of keeping the basicity of slag formed by melting of the ash belonging to the predetermined range into the furnace body through the inlet. In the method for operating a melting furnace according to claim 3,
In the melting step, among the slag formations, ash contained in the combustible gas and belonging to the ash region group and ash discharged from equipment different from the gasification furnace, the ash region A member belonging to a group is allowed to flow into the furnace body through the inlet;
In the adjusting agent supplying step, among the plurality of types of region-specific adjusting agents, each has a particle size within a range of particle sizes set in each particle size region belonging to the ash region group and in the region A method for operating a melting furnace, comprising supplying a component containing a component capable of keeping the basicity of slag formed by melting of the ash belonging to the predetermined range into the furnace body through the inlet. In the operation method of the melting furnace according to claim 1,
The furnace main body further has a supply port that allows inflow of the non-combustible material discharged from at least one of the gasification furnace and the facility different from the gasification furnace as the slag formation material into the slag by melting. Using things,
In the melting step, among the slag formations, ash contained in the combustible gas, and belonging to an ash region group consisting of two or more particle size regions of the plurality of particle size regions, the inflow port And inflowing into the furnace main body, and forming slag by melting of the non-combustible material among the slag forming material, and including a non-combustible material region including two or more particle size regions of the plurality of particle size regions A member belonging to a group is allowed to flow into the furnace body through the supply port;
In the adjusting agent supplying step, among the plurality of types of region-specific adjusting agents, each has a particle size within a range of particle sizes set in each particle size region belonging to the ash region group and in the region A component containing a component capable of keeping the basicity of the slag formed by melting the ash belonging to the predetermined range is supplied into the furnace body through the inlet, and Among them, the basicity of the slag having a particle size within the range of the particle size set for each particle size region belonging to the incombustible material region group and formed by melting of the incombustible material belonging to the region A method for operating a melting furnace, comprising supplying a component that can be contained in a predetermined range into the furnace body through the supply port.

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