JP2009250496A - Combustion auxiliary device of melting furnace - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a combustion auxiliary device of a melting furnace for surely separating combustible components from waste to effectively utilize the same, improving combustion efficiency, and being easily installed in an existing melting furnace. <P>SOLUTION: The combustible component of solid phase included in the waste X on a mesh tray 2 is melted and changed to a liquid phase when hot air in a combustion chamber H of the melting furnace M is distributed into a housing from a hot air intake 11a of a sub-combustion chamber 1, and falls on a receiving tray member 3 to be stored inside, meanwhile, the stored combustible component P in a liquid phase state is thermally decomposed in the receiving tray member 3 by the hot air and evaporated, the combustible component P in the vapor phase state is carried and supplied to a flame radiating section or a fuel supplying section in the burner B from the combustible gas component discharge port 11b by the rising thermal air current distributed from the hot air intake 11a, and circulated inside of the housing to assist the combustion. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention is an improvement of a combustion apparatus such as an incinerator or a melting furnace. More specifically, it can reliably separate a combustible component from a waste, and can effectively use it to improve combustion efficiency. The present invention relates to a combustion auxiliary device for a melting furnace that can be easily attached to a melting furnace.

  As is well known, incinerators and melting furnaces are used to incinerate waste and to melt and extract metal resources, and these devices emit high-temperature flames into the furnace by burners. Can do.

  By the way, since combustion of such a burner has a problem of consuming a large amount of fuel, there are some which supply auxiliary fuel to the burner, for example, by pulverizing waste containing combustible components, An apparatus that directly puts into a flame is disclosed (for example, see Patent Documents 1-3).

  However, such an apparatus has been unsatisfactory in that the waste must be finely pulverized in order to facilitate burning of the waste to be charged, which increases the processing cost.

  In addition, since the waste to be introduced contains a lot of impurities other than combustible components, a large amount of residues are inevitably generated, causing clogging of the details of the apparatus, and cleaning the inside of the furnace is troublesome. There is a problem.

In particular, when putting waste directly into a metal melting furnace, the furnace interior is very hot, and as soon as it is put in, even impurities in the waste are vaporized, making it difficult to separate the combustible components from the impurities. There is a fact that it is.
JP-A-6-323526 (page 2-3, FIG. 1-2) Japanese Patent Laid-Open No. 7-119922 (page 3-6, FIG. 1-6) Japanese Patent Laying-Open No. 2005-337511 (page 4-7, FIG. 1-3)

  The present invention has been made in view of the above-described problems in the conventional supply device, and the object of the present invention is to reliably separate the combustible component from the waste and effectively utilize it. It is an object of the present invention to provide a combustion auxiliary device for a melting furnace that can improve the combustion efficiency and can be easily attached to an existing melting furnace.

  Means employed by the present inventor for solving the above-described problems will be described with reference to the accompanying drawings.

That is, according to the present invention, the burner B that supplies main fuel from the main system and burns it is attached to the melting furnace M that can emit the flame F toward the combustion chamber H, and the auxiliary fuel is supplied to the burner B. An auxiliary combustion device that can assist combustion,
The auxiliary combustion apparatus 1 includes a hollow body in which at least a hot air intake port 11a and a combustible component discharge port 11b are opened. The hot air intake port 11a communicates with the combustion chamber H and the combustible component discharge port 11b. While communicating with the flame radiating section or fuel supply section in the burner B,
The crushed waste X is placed on the mesh mesh tray 2, and the mesh tray 2 can reciprocate the inside and outside of the housing of the sub-combustor 1 to continuously introduce the waste X.
A tray member 3 is installed on at least a part of the sub-combustor 1 below the track of the mesh tray 2,
When the hot air in the combustion chamber H of the melting furnace M is fed into the housing from the hot air intake port 11a of the auxiliary combustion device 1, the solid combustible component P contained in the waste X on the mesh tray 2 is obtained. Is melted and changed into a liquid phase, dropped onto the tray member 3 and stored inside,
The stored liquid phase combustible component P is thermally decomposed and vaporized in the saucer member 3 by hot air,
The combustible component P in the gas phase state is conveyed from the combustible component discharge port 11b to the flame radiating section or the fuel supply section in the burner B by the rising hot air flow that is fed from the hot air intake port 11a and circulates inside the housing. By adopting the technical means of supplying and assisting combustion, a combustion assist device in a melting furnace was completed.

  Further, in order to solve the above-described problems, the present invention employs technical means for forming a heat radiation path 13 for temperature drop in the housing of the auxiliary fuel device 1 in addition to the above means as necessary.

  Furthermore, in order to solve the above-mentioned problems, the present invention forms a hot air intake port 11a at the lower part of the housing of the auxiliary combustion apparatus 1 as necessary, and discharges combustible component at the upper part of the housing. The technical means of forming the outlet 11b was adopted.

In the present invention, the burner B that supplies the main fuel from the main system and burns it is attached to the melting furnace M that can emit the flame F toward the combustion chamber H, and the auxiliary fuel is supplied to the burner B. An auxiliary combustion device that can assist combustion,
A heat transfer plate 11c is provided between the auxiliary combustion device 1 and the combustion chamber H, and the auxiliary combustion device 1 includes a hollow body having at least a combustible component discharge port 11b opened. While the gas component discharge port 11b communicates with the flame radiating section or the fuel supply section in the burner B,
The crushed waste X is placed on the mesh mesh tray 2, and the mesh tray 2 can reciprocate the inside and outside of the housing of the sub-combustor 1 to continuously introduce the waste X.
A tray member 3 is installed on at least a part of the sub-combustor 1 below the track of the mesh tray 2,
The heat in the combustion chamber H of the melting furnace M is conducted into the housing through the heat transfer plate 11, so that the solid combustible component P contained in the waste X on the mesh tray 2 is melted. While changing into a liquid phase, it is dropped on the tray member 3 and stored inside,
The stored liquid phase combustible component P is thermally decomposed and vaporized in the tray member 3 by radiant heat, and the volume expands inside the housing.
Technical means that the expanded combustible component P in the gas phase overflows from the combustible component discharge port 11b and is transported and supplied to the flame radiating section or the fuel supply section of the burner B to assist combustion. By adopting, a combustion auxiliary device in the melting furnace can be completed.

  Further, in order to solve the above-mentioned problems, the present invention forms a vent hole 12 for introducing cooling air for temperature drop in the housing of the auxiliary fuel device 1 in addition to the above means as necessary. The technical means was adopted.

  Furthermore, in order to solve the above-described problems, the present invention provides a transport for successively discharging the residue after separating the combustible component P from the waste X on the mesh tray 2 in addition to the above means as necessary. The technical means of providing means 21 was adopted.

  Furthermore, in order to solve the above-described problems, the present invention employs technical means in which the auxiliary combustion device 1 is configured to be detachable independently of the melting furnace M in addition to the above-described means as necessary.

In the present invention, the auxiliary combustion device includes a hollow body that opens at least a hot air intake port and a combustible component discharge port, the hot air intake port communicates with the combustion chamber, and the combustible component discharge port is connected to the combustion chamber. While communicating with the flame radiating section or fuel supply section of the burner, the crushed waste is placed on a mesh mesh tray, and the mesh tray is moved back and forth between the inside and outside of the housing of the auxiliary fueling device to continuously dispose of the waste. And at least part of the mesh tray below the orbit of the mesh tray inside the auxiliary fuel device, by installing a tray member,
When the hot air in the combustion chamber of the melting furnace is fed into the housing from the hot air inlet of the auxiliary combustion device, the combustible component of the solid phase contained in the waste on the mesh tray melts and changes to the liquid phase On the other hand, the liquid phase combustible component that is dripped onto the saucer member and stored therein is thermally decomposed and vaporized in the saucer member by hot air, and the gas phase combustible component is The rising hot air stream that is fed from the hot air inlet and circulates inside the housing can be transported and supplied from the combustible component discharge port to the flame radiating section or the fuel supply section of the burner to assist combustion.

  Therefore, by using the combustion auxiliary device in the melting furnace of the present invention, the combustible component can be reliably separated from the waste and effectively used, and the combustion efficiency of the burner can be improved.

  Moreover, since it can be easily attached to an existing melting furnace, the investment equipment cost can be reduced, and the practical utility value is very high.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described in more detail with reference to the drawings specifically shown as follows.

“First Embodiment”
A first embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a sub-combustion device, and this sub-combustion device 1 has a hollow body in which at least a hot air intake port 11a and a combustible air component discharge port 11b are opened.

  Also, what is indicated by reference numeral 2 is a mesh tray, and this mesh tray 2 is a mesh-like tray member on which crushed waste X can be placed. Sex wire mesh can be used.

  Furthermore, what is indicated by reference numeral 3 is a tray member, and this tray member 3 is a bottomed container using a heat-resistant material such as ceramics and contains a combustible component P (resin described later) in a molten state. Is possible.

  Therefore, the present invention is an auxiliary combustion apparatus that can supply auxiliary fuel to the burner B to assist combustion, and the use procedure will be described below. First, the present apparatus can be attached to a melting furnace M capable of radiating a flame F toward the combustion chamber H by a burner B which supplies main fuel from the main system and burns it.

  The melting furnace M only needs to have a known structure, and the main fuel of the burner B includes petroleum gas and heavy oil. Moreover, the flame F which the burner B radiates | emits can expand a combustion range, and can strengthen a thermal power by blowing out helically. The furnace temperature of the combustion chamber H is about 1000 ° C. or higher.

  In the present embodiment, the hot air intake port 11a of the auxiliary combustion apparatus 1 communicates with the combustion chamber H, and hot air can be taken from the combustion chamber H. Further, the combustible component discharge port 11b communicates with the flame radiating portion or the fuel supply portion in the burner B, and in this embodiment, the flammable component discharge port 11b supplies the portion (flame radiating portion) immediately after the flame F is emitted.

  At this time, since the flame F due to the combustion of the main fuel is radiated, a negative pressure is generated at a point where the combustible component discharge port 11b communicates with the combustible component discharge port 11b of the auxiliary fuel device 1. The gas can be smoothly taken in and circulated.

  Then, the waste X, which is a secondary fuel, is placed on the mesh tray 2. As the waste X, waste plastics can be used. The combustible component P contained in the waste X includes, for example, olefinic thermoplastic resins such as polyethylene, polypropylene, and polybutylene, or polymethyl acrylate and polymethacrylic acid. Examples thereof include acrylic thermoplastic resins such as methyl, other polyacrylic acid esters and polymethacrylic acid esters, polyacrylamides, and polyacrylonitrile.

  Further, styrene resins such as ABS, vinyl chloride resins, vinyl acetate resins, polyvinylidene chloride, polyamides such as polyvinyl alcohol and nylon, saturated polyester resins such as PET (polyethylene terephthalate), polycarbonate, polyvinyl acetals, polyethers , Celluloses, petroleum resins, polyphenylene sulfide, rubbers, phenol resins, urea resins, melamine resins, allyl resins, unsaturated polyesters, epoxy resins, polyimides, polyurethanes, etc. Use with limited amount.

  In the present embodiment, as the waste X, a polypropylene solid such as a waste pallet is crushed to about 2 to 4 cm and processed into a pellet. This polypropylene has a melting point of about 170 ° C. and a thermal decomposition (vaporization) temperature of about 400 to 500 ° C.

  Next, the mesh tray 2 can reciprocate waste X continuously by reciprocating inside and outside the housing of the auxiliary fuel device 1. In the present embodiment, it is possible to provide a conveying means 21 for discharging the impurities Z (residues) after separating the combustible component P from the waste X on the mesh tray 2 one after another. A conveyor or the like that can move in and out of the housing continuously or intermittently while rotating the mesh tray 2 in the horizontal direction can be employed.

  In addition, a tray member 3 is installed in at least a part of the sub-combustor 1 below the track of the mesh tray 2.

  Then, the hot air in the combustion chamber H of the melting furnace M is sent into the housing from the hot air intake port 11a of the sub-combustor 1, whereby the combustible solid phase contained in the waste X on the mesh tray 2 is obtained. The component P melts and changes to a liquid phase, and is dropped onto the tray member 3 and stored. At this time, the combustible component P is boiled by heat in the tray member 3. At this time, the temperature in the housing of the auxiliary fuel device 1 is preferably about 600 ° C.

  In the present embodiment, a vent hole 12 for introducing cooling air for temperature drop in the housing of the auxiliary fuel device 1 can be formed. By opening and closing the vent hole 12 as appropriate, the housing The temperature can be adjusted so that the combustible component P in the waste X becomes a gas-liquid mixed state in which the solid phase and the gas phase are mixed.

  Thereafter, the combustible component P in the liquid phase stored in the tray member 3 is thermally decomposed and vaporized in the tray member 3 by hot air, and the combustible component P in the gas phase is converted into the hot air inlet 11a. Ascending hot air flowing through the housing and circulating inside the housing is transported and supplied from the combustible component discharge port 11b to the flame radiating section (or fuel supply section) of the burner B to assist combustion.

  Moreover, in this embodiment, the hot air intake port 11a can be formed in the lower part of the housing of the auxiliary combustion apparatus 1, and the combustible component discharge port 11b can be formed in the upper part of the housing, so that the circulation of the air flow by heat can be smoothly performed. can do. Note that these formation positions can be changed according to the shape of the existing melting furnace M.

“Second Embodiment”
Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, the heat radiation path 13 for the temperature drop in the housing of the auxiliary combustion apparatus 1 can be formed. Specifically, a passage is provided that detours to a predetermined distance when hot air is taken into the housing from the hot air inlet 11a.

  With this configuration, the combustible component P in the waste X is in a gas-liquid mixed state in which the solid phase and the gas phase are mixed in the housing as in the case where the vent hole 12 is provided. The temperature can be adjusted. Of course, it is possible to arrange the heat radiation path 13 and the vent hole 12 in parallel.

“Third embodiment”
Next, a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the combustible component P once melted on the mesh tray 2 is dropped onto the guide plate 31 and then flows into the tray member 3.

  Thus, by adjusting the distance between the mesh tray 2 and the tray member 3, it is possible to appropriately create a gas-liquid mixed state in the housing due to the difference between the melting point of the combustible component P and the vaporization (pyrolysis) temperature. it can.

“Fourth Embodiment”
Next, a fourth embodiment of the present invention will be described with reference to FIG. In the present embodiment, a heat transfer plate 11c is provided between the auxiliary combustion device 1 and the combustion chamber H. The heat transfer plate 11c is preferably made of a metal material having high thermal conductivity such as aluminum or iron.

  Further, the auxiliary fuel device 1 includes a hollow body having at least a combustible component discharge port 11b opened, and the combustible component discharge port 11b communicates with a flame radiating unit or a fuel supply unit in the burner B.

  Subsequently, the heat in the combustion chamber H of the melting furnace M is conducted into the housing through the heat transfer plate 11 and is contained in the waste X on the mesh tray 2 as in the previous embodiment. The combustible component P in the solid phase is melted and changed into a liquid phase, dropped onto the tray member 3 and stored inside.

  The stored combustible component P in the liquid phase is thermally decomposed and vaporized in the tray member 3 by radiant heat, and the volume expands inside the housing.

  Thereafter, the expanded combustible component P in the gas phase overflows from the combustible component discharge port 11b and is transported and supplied to the flame radiating section or the fuel supply section of the burner B to assist combustion.

  The present invention is generally configured as described above. However, the present invention is not limited to the illustrated embodiment, and various modifications can be made within the description of “Claims”. 1 can be configured to be detachable independently of the melting furnace M, and can be attached to an existing melting furnace as an attachment.

  Further, the shape and material of the mesh tray 2 can be changed according to the shape and material of the waste X, and any of these belong to the technical scope of the present invention.

It is an explanatory front view showing the combustion auxiliary device of a 1st embodiment of the present invention. It is an explanatory front view showing the combustion auxiliary device of a 1st embodiment of the present invention. It is an explanatory front view showing the combustion auxiliary device of a 1st embodiment of the present invention. It is an explanatory front view showing the combustion auxiliary device of a 2nd embodiment of the present invention. It is an explanatory front view showing the combustion auxiliary device of a 3rd embodiment of the present invention. It is an explanatory front view showing the combustion auxiliary device of a 4th embodiment of the present invention.

Explanation of symbols

1 Secondary combustion device
11a Hot air inlet
11b Combustible component outlet
11c Heat transfer plate
12 Vent
13 Heat dissipation path 2 Mesh tray
21 Conveying means 3 Trays
31 Guide plate M Melting furnace H Combustion chamber B Burner F Flame X Waste P Combustible component Z Impurity

Claims (7)

Attaching to the melting furnace M capable of radiating a flame F toward the combustion chamber H by the burner B that supplies the main fuel from the main system and burns, and supplies the auxiliary fuel to the burner B to assist combustion. A secondary combustion device capable of
The auxiliary combustion apparatus 1 includes a hollow body in which at least a hot air intake port 11a and a combustible component discharge port 11b are opened. The hot air intake port 11a communicates with the combustion chamber H and the combustible component discharge port 11b. While communicating with the flame radiating section or fuel supply section in the burner B,
The crushed waste X is placed on the mesh mesh tray 2, and the mesh tray 2 can reciprocate the inside and outside of the housing of the sub-combustor 1 to continuously introduce the waste X.
A tray member 3 is installed on at least a part of the sub-combustor 1 below the track of the mesh tray 2,
When the hot air in the combustion chamber H of the melting furnace M is fed into the housing from the hot air intake port 11a of the auxiliary combustion device 1, the solid combustible component P contained in the waste X on the mesh tray 2 is obtained. Is melted and changed into a liquid phase, dropped onto the tray member 3 and stored inside,
The stored liquid phase combustible component P is thermally decomposed and vaporized in the saucer member 3 by hot air,
The combustible component P in the gas phase state is conveyed from the combustible component discharge port 11b to the flame radiating section or the fuel supply section in the burner B by the rising hot air flow that is fed from the hot air intake port 11a and circulates inside the housing. A combustion assisting device in a melting furnace, wherein the combustion assisting device is supplied to assist combustion.   2. A combustion assisting device in a melting furnace according to claim 1, wherein a heat radiation path for temperature drop in the housing of the auxiliary combustion device is formed.   3. A combustion auxiliary apparatus in a melting furnace according to claim 1, wherein a hot air intake port 11a is formed at the lower part of the housing of the auxiliary fuel unit 1, and a combustible gas component discharge port 11b is formed at the upper part of the housing. . Attaching to the melting furnace M capable of radiating a flame F toward the combustion chamber H by the burner B that supplies the main fuel from the main system and burns, and supplies the auxiliary fuel to the burner B to assist combustion. A secondary combustion device capable of
A heat transfer plate 11c is provided between the auxiliary combustion device 1 and the combustion chamber H, and the auxiliary combustion device 1 includes a hollow body having at least a combustible component discharge port 11b opened. While the gas component discharge port 11b communicates with the flame radiating section or the fuel supply section in the burner B,
The crushed waste X is placed on the mesh mesh tray 2, and the mesh tray 2 can reciprocate the inside and outside of the housing of the sub-combustor 1 to continuously introduce the waste X.
A tray member 3 is installed on at least a part of the sub-combustor 1 below the track of the mesh tray 2,
The heat in the combustion chamber H of the melting furnace M is conducted into the housing through the heat transfer plate 11, so that the solid combustible component P contained in the waste X on the mesh tray 2 is melted. While changing into a liquid phase, it is dropped on the tray member 3 and stored inside,
The stored liquid phase combustible component P is thermally decomposed and vaporized in the tray member 3 by radiant heat, and the volume expands inside the housing.
In the melting furnace, the expanded combustible component P in the gas phase overflows from the combustible component discharge port 11b and is transported and supplied to the flame radiating section or the fuel supply section in the burner B to assist combustion. Combustion assist device.   In the melting furnace according to any one of claims 1 to 4, wherein a vent hole (12) for introducing cooling air for temperature drop in the housing of the auxiliary combustion device (1) is formed. Combustion assist device.   The conveying means 21 for discharging | emitting the residue after separating the combustible component P from the waste X on the mesh tray 2 one after another is provided. Combustion assisting device in the melting furnace.   The combustion auxiliary device for a melting furnace according to any one of claims 1 to 6, wherein the auxiliary combustion device (1) is configured to be detachable independently of the melting furnace (M).

Images