JP2001065837A - Rotary kiln using powder burner using coated nugget debris, etc., as auxiliary fuel, and its kiln operation method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cost performance by adjusting dwelling time of covered nugget debris, etc., in a powder burner, and further reduce the consumption of auxiliary fuel such as heavy oil. SOLUTION: A fuel such as regenerated heavy oil, etc., is combusted with an oil burner 14 provided in the vicinity of the top of a powder burner 10 including a substantially cylindrical combustion chamber 12 provided vertically, and primary air and covered nugget debris, etc., are injected tangentially from a primary air injection hole 16 and is combusted while being turned in the combustion chamber. Industrial waste supplied into a rotary kiln 1 is incinerated by introducing produced flame into the rotary kiln 1 using a blow nozzle 30.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary kiln using a powder burner which uses a coated nugget scrap such as a metal wire-coated tip or a crushed synthetic resin as an auxiliary fuel, and a method of operating the kiln. A coating that can reduce the consumption of fuel such as regenerated heavy oil by using coated nugget chips and the like as auxiliary fuel for powder burners used as rotary kiln burners used as industrial waste incinerators The present invention relates to a rotary kiln using a powder burner using nugget waste or the like as an auxiliary fuel, and a method for operating the kiln.

[0002]

2. Description of the Related Art Industrial waste, except for special ones, is incinerated by an incinerator that is optimal for the industrial waste. The incineration treatment is a sanitary and excellent treatment method because the volume can be reduced in a short time and the product after the treatment becomes a small amount of inorganic ash.

However, among industrial wastes, liquid industrial wastes are difficult to incinerate. The main liquid industrial wastes include waste oils such as lubricating oils, cutting oils and insulating oils, and waste liquids such as photographic developing solutions and plating solutions. Waste oils and liquids often contain a lot of water,
It is extremely difficult to incinerate alone. Conventionally, as an incinerator that can incinerate these liquid industrial wastes, there is an incinerator with a rotary kiln / stoker shown in FIG.

In order to incinerate waste oil and waste liquid, which are liquid industrial wastes, using such a rotary kiln / stoker combined incinerator, first, the waste oil is previously separated into moisture and oil, and the separated oil (recycled) is used. Heavy oil) is used as fuel for the auxiliary burner 78 of the rotary kiln incinerator 70 for incineration. On the other hand, the waste liquid cannot be directly burned because it contains a large amount of water and it is difficult to separate only the water. Therefore, the waste liquid is sprayed in the form of a mist using the nozzle 83 and sprayed into the secondary combustion furnace 86 by utilizing the heat generated when the residue of the stoker-type incinerator 80 is burned.
Was incinerated.

[0005] The rotary kiln / stoker combined type incinerator is divided into a rotary kiln type incinerator 70 for incinerating waste oil and a stoker type incinerator 80 for incinerating waste liquid. And it had to be big.

The applicant has filed a patent application to provide a rotary kiln-type industrial waste incinerator as shown in FIG. 5 (Japanese Patent Application Laid-Open No. 10-141638). In such a rotary kiln-type industrial waste incinerator 1, a primary combustion chamber 4 is formed in a rotary furnace 2, and a nozzle 3 for injecting liquid industrial waste such as waste liquid, , Which pushes solid industrial waste such as shredder dust
A chute 6 with a and an auxiliary burner 8 for burning industrial waste are arranged. Various industrial wastes are burned in the primary combustion chamber 4 and incinerated ash is discharged from a residue discharge port 9 provided at the other end of the rotary furnace 2. The combustion gas is cooled to 100 ° C. or lower by a cooling tower (not shown) from an exhaust duct 9 a provided above the residue discharge port 9, and then sent to a conventionally known exhaust gas cleaning device.

[0007] Metal wire-coated chips (coated nugget debris) are obtained by finely cutting waste copper wires or aluminum wires, which are a kind of industrial waste generated in large quantities at civil engineering construction sites, and removing the metal content. Coating material), and is made of polypropylene (PP) or polyethylene (PE), vinyl chloride (PVC), coated fiber (paper), and metal (copper or aluminum). Other wastes mainly composed of synthetic resin include polyethylene containers (P
E), chemical drum (made of PE), automobile bumper (PP
And OA equipment plastic (made by ABS). In particular, PP and PE are composed of carbon and hydrogen, and can recover thermal energy in the same manner as petroleum-based fuels. However, since the calorific value is high, the incinerator material is damaged,
Combustion treatment was not possible with ordinary stoker-type incinerators, rotary-type incinerators, and industrial waste fluidized incinerators used as municipal industrial waste incineration facilities. Also, P
The method of thermally decomposing P and PE and reusing them as fuel has a problem in terms of cost. As a result, conventionally, there has been only a method of separating and collecting as unsuitable for incineration and landfill disposal.

Also, when PE is incinerated by using a special combustion device, hydrogen chloride is generated from a trace amount of chlorine contained in a plastic compounding agent such as a crosslinking agent, an antioxidant, and an ultraviolet absorber. Therefore, a conventionally well-known exhaust gas cleaning device has to be installed in the incinerator, and there is a disadvantage that the construction cost becomes extremely high when considered as a whole treatment system.

Therefore, the applicant uses a powder burner as a burner for an industrial waste incinerator and uses a metal wire-coated chip (coated nugget waste), which is industrial waste, as a part of the fuel to assist heavy oil and the like. To provide a “method of treating metal wire coated chips” that can reduce the fuel consumption and also move the residue in the powder burner toward the inside of the industrial waste incinerator to treat it. A patent application was filed (JP-A-10-185162).

[0010]

However, as shown in FIG. 6, the powder burner body 52 used in this method has a substantially cylindrical shape and is inclined so as to decrease by an angle θ toward the inside of the furnace 4. The residence time of the metal wire-coated tip introduced into the powder burner main body 52 from the nozzle 54 and adjusted when the primary air is moved inside the furnace 4 while swirling is adjusted. There was a problem that was difficult. In addition, the powder burner 52 burns the regenerated heavy oil as fuel using the burner 60, but there is a problem that the cost of the regenerated heavy oil increases with an increase in the amount of waste and the operating cost is high. . In addition, 5
8 is a blower for introducing tertiary air, and 56 is an injection port for introducing secondary air.

Therefore, the present invention is capable of adjusting the residence time in a powder burner such as metal wire-coated chips or coated nugget debris such as pulverized synthetic resin, which is industrial waste used as fuel for an industrial waste incinerator. Coated nugget that provides a rotary kiln and a method of operating the kiln using a powder burner using auxiliary coated nugget debris as an auxiliary fuel, further reduces the consumption of auxiliary fuel such as heavy oil, and improves cost performance An object of the present invention is to provide a rotary kiln using a powder burner that uses waste or the like as an auxiliary fuel, and a method for operating the kiln.

[0012]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention according to claim 1 is provided near a top of a powder burner having a vertical combustion chamber having a substantially cylindrical combustion chamber. Fuel such as regenerated heavy oil is burned by the oil burner, and primary air and coated nugget debris such as metal wire-coated chips and pulverized synthetic resin, which serve as auxiliary fuel, are discharged from a primary injection port located near the oil burner. The fuel is injected into the combustion chamber from a tangential direction and burns while swirling in the combustion chamber. The generated flame extends from the bottom of the combustion chamber and is introduced into the rotary kiln by a blow nozzle connected thereto. Provided is a rotary kiln using a powder burner that uses coated nugget debris for incinerating industrial waste supplied therein as an auxiliary fuel.

An oil burner provided near the top of the powder burner burns fuel such as regenerated heavy oil. Then, coated nugget debris and the like are injected into the combustion chamber together with the primary air from the primary injection port, and burned while swirling in the combustion chamber. The industrial waste supplied into the rotary kiln is incinerated by introducing the flame generated in the combustion chamber from the blowing nozzle into the rotary kiln.

According to a second aspect of the present invention, there is provided a rotary kiln using a powder burner which uses coated nugget debris or the like as an auxiliary fuel. It has a second injection port for introducing tertiary air into the combustion chamber of the powder burner, and a third injection port for introducing tertiary air into the combustion chamber of the body burner. A second injection port is provided in the combustion chamber of the powder burner for replenishing combustion air and facilitating swirling, and a third injection port is provided for discharging residues in the combustion chamber into the rotary kiln.

According to a third aspect of the present invention, there is provided a rotary kiln using a powder burner using a coated nugget dust or the like as an auxiliary fuel according to the second aspect of the present invention. Is introduced from the tangential direction near the middle of the combustion chamber of the powder burner, and the tertiary air is introduced from the axial flow direction of the blowing nozzle connecting the combustion chamber of the powder burner and the rotary kiln. It is characterized by that. When the coated nugget chips and the like are introduced into the combustion chamber together with the primary air from the tangential direction, the coated nugget chips and the like stay in the powder burner and swirl in the combustion chamber over time. Then, in order to replenish the combustion air and promote the swirling, secondary air is introduced from a tangential direction near the middle of the combustion chamber. Then, tertiary air is introduced from the axial direction of the blow nozzle in order to blow the residue in the combustion chamber into the rotary kiln.

According to a fourth aspect of the present invention, there is provided a rotary kiln using a powder burner using the coated nugget chips or the like as an auxiliary fuel according to the fourth aspect of the present invention. , Characterized in that the coated nugget debris or the like serving as an auxiliary fuel is polyethylene.

According to a fifth aspect of the present invention, there is provided a fuel oil regenerated by means of an oil burner provided near a top of a powder burner having a substantially cylindrical combustion chamber which stands upright. And a step of burning fuel such as, and primary air and coated nugget debris, such as metal wire-coated chips or pulverized synthetic resin, serving as auxiliary fuel from the primary injection port arranged near the oil burner are introduced into the combustion chamber. Injecting from the tangential direction and burning while turning the combustion chamber,
A step of introducing secondary air from a second injection port provided near an intermediate portion of the combustion chamber of the powder burner into the combustion chamber of the powder burner from a tangential direction thereof; and A step of introducing into the combustion chamber of the powder burner from a third injection port provided near the blowing nozzle connecting the rotary kiln, and extending and connecting the flame generated in the powder burner from the bottom side of the combustion chamber And a step of incineration of industrial waste supplied into the rotary kiln by the blown nozzle, and a powder burner using a coated nugget debris or the like as an auxiliary fuel. Provide a method of operating a rotary kiln.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a rotary kiln using a powder burner using a coated nugget waste or the like as an auxiliary fuel according to the present invention will be described based on a preferred embodiment shown in the drawings. FIG. 1 is an explanatory view showing an embodiment of a rotary kiln using a powder burner using a coated nugget waste or the like as an auxiliary fuel according to the present invention, and FIG. 2 is a side view of the rotary kiln shown in FIG. is there.

First, a rotary kiln A using a powder burner using a coated nugget waste or the like according to the present invention as an auxiliary fuel is:
As an outline, the rotary kiln body 1 and the powder burner 10
And a blowing nozzle 30 provided to connect the two. The powder burner 10 is shown in FIG.
As shown in the figure, the inside thereof has a cylindrical combustion chamber 12 erected in a vertical direction, and an oil burner 14, a coated nugget debris and the like and a primary air injection port 16,
A secondary air injection port 18 is provided for each injection to be
It is provided so as to be introduced from the tangential direction inside. Further, a tertiary air injection port 19 is provided so as to be introduced into the combustion chamber 12 from an axial flow direction of a later-described blowing nozzle 30.

The oil burner 14 includes an oil pump 14a
Fuel oil and combustion air blower 14 as fuel sent from
The air sent from b is injected into the combustion chamber 12 to heat the furnace. The oil burner 14 is used for preheating the combustion chamber 12 and has an internal temperature of 400 to 500 ° C.
When the oil burner 14 is reached, the fire is extinguished. After that, combustion is continued only by blowing coated nugget debris or the like into the combustion chamber 12. This makes it possible to further reduce the running cost of the regenerated heavy oil as fuel.

Coated nugget debris etc. and primary air injection port 16
Is introduced into the combustion chamber 12 in a state in which coated nugget waste used as fuel and the like and primary air are mixed. The coated nugget debris and the like are cut into about 1 to 8 mm and stored in the raw material hopper 15a, and a screw conveyor 15b is disposed below the raw material hopper 15a. A disk feeder 1 for gradually sending out coated nugget debris and the like sent by the screw conveyor 15b.
5c is provided. In addition, screw conveyor 15b
A buffer may be provided between the disk feeder 15c and the disk feeder 15c so that the feed amount can be kept constant.

The coated nugget chips and the like supplied from the disk feeder 15c are supplied to the roots blower 16 for supplying primary air.
The primary air sent out from a is sprayed into the combustion chamber 12 from the coated nugget debris and the like and the primary air injection port 16.
In the present embodiment, the secondary and tertiary air blowers are also branched by using the roots blower 16a to branch the piping.
Air is supplied to the secondary air injection port 18 and the tertiary air injection port 19 while adjusting the optimum pressure. Of course, blowers can be provided for secondary and tertiary air, respectively.

The blowing nozzle 30 is provided so as to connect the bottom 12a of the powder burner 10 to the side of the rotary kiln body 1 on the opposite side. Coated nugget debris burns in the combustion chamber 12 and the generated flame is
Is discharged from the bottom 12a and is introduced into the rotary kiln body 1 through the blowing nozzle 30.

In general, the residence time of the coated nugget debris and the like in the combustion chamber 12 varies depending on the velocity of the coated nugget debris and the like and the primary air when they are introduced into the combustion chamber 12. If the velocity of the coated nugget debris and the like and the primary air is high, the coated nugget debris and the like and the primary air will spirally move along the inner peripheral surface of the combustion chamber 12 for a long time, and accordingly, the residence time will also be long. In addition, since the coated nugget debris and the like are in a high temperature state near the combustion chamber outlet of the powder burner and are easily burned, the secondary air is discharged from the secondary air injection port 18 provided near the middle part of the combustion chamber 12. It is possible to adjust so as to perform complete combustion by introducing the tertiary air from the tertiary air injection port 19 provided near the bottom of the combustion chamber 12. Further, the shape of the flame introduced into the rotary kiln body 1 by the injection of the tertiary air can be optimized. Generally, the flame introduced into the rotary kiln body 1 preferably has a shape that can be applied to a wide range so that the industrial waste supplied to the rotary kiln body 1 can be burned. The shape is long in the horizontal direction.

The basic structure of the rotary kiln body 1 is substantially the same as that shown in FIG.
The primary combustion chamber 4 is formed therein. Rotary furnace 2
A nozzle 3 for injecting liquid industrial waste such as waste liquid and a chute 6 with a pusher 6a for introducing solid industrial waste such as sludge and shredder dust are arranged at one end of the industrial waste. A powder burner 10 is arranged in place of the auxiliary combustion burner 8 to be burned, and the flame is introduced into the primary combustion chamber by the blowing nozzle 30. The inner wall of the rotary kiln body 1 is heat-treated so that it can withstand a high-temperature atmosphere. As a result, even if PE or the like having a high thermal calorie is burned, it can withstand sufficiently.

Various industrial wastes are burned in the primary combustion chamber 4 and incinerated ash is discharged from a residue discharge port 9 provided at the other end of the rotary furnace 2. The combustion gas is supplied from an exhaust duct 9a provided above the residue discharge port 9 to a cooling tower (not shown).
After being cooled to 0 ° C. or lower, it is sent to a conventionally known exhaust gas cleaning apparatus. In the drawings, reference numerals 2a and 2b denote rails and rack gears formed on the outer peripheral surface of the rotary furnace 2. Reference numerals 5a and 5b rotate a pair of rollers supporting the rail 2a and a pinion gear 5c meshing with the rack gear 2b. It is a motor. Numeral 3a is a trumpet-shaped injection port shaped so that the liquid industrial waste injected from the blowing nozzle 3 is diffused beautifully.

Next, a method of operating the rotary kiln A using a powder burner using a coated nugget waste or the like as an auxiliary fuel will be described. As shown in FIG. 4, first, as a preparatory stage, coated nugget scraps cut to about 1 to 8 mm are stored in a raw material hopper 15a, and can be supplied to a disk feeder 15c by a screw conveyor 15b. . As described above, a coated nugget or the like is a residue obtained by finely cutting a waste copper wire or an aluminum wire, which is a kind of industrial waste generated in civil engineering construction sites and the like, and removing metal components (coated nugget waste). And synthetic resin such as polyethylene containers, chemical drums (made of PE), automobile bumpers (made of PP), and OA equipment plastics (made of ABS).

The main component of the coated nugget waste is a plastic made of synthetic resin such as polypropylene or polyethylene.
Since the specific gravity is 0.9 and 0.94, it can be separated from a copper wire or an aluminum wire by specific gravity separation when put in water having a specific gravity of 1. When a copper nugget waste having an appropriate length is put into a water tank and stirred, PP, PE, and the like are peeled off from metal components and float on the water surface. At the bottom of the aquarium, coated fibers (paper) and vinyl chloride precipitate along with the metal. At this stage, vinyl chloride, which is a cause of generation of hydrogen chloride, can be separated from PP and PE.

Then, together with the combustion air supplied from the combustion air blower 14b, the regenerated heavy oil as fuel is fed from the oil pump 14a to the oil burner 14 provided near the top of the powder burner and burned in the combustion chamber 12. (Step 1). Next, the coated nugget chips and the like, which can be supplied as auxiliary fuel, are supplied from the primary air injection port 16 to the combustion chamber 1 together with the air sent from the roots blower 16a.
The fuel is injected into the combustion chamber 12 from the tangential direction into the combustion chamber 12 and burned while swirling inside the combustion chamber 12 (step 2).

Then, a part of the air sent from the roots blower 16a is introduced from the secondary air injection port 18 into the combustion chamber 12 of the powder burner 10 from its tangential direction (step 3), and further sent from the roots blower 16a. Part of the air is introduced from the tertiary air injection port 19 into the combustion chamber 12 of the powder burner 10 (step 4). Then, the flame generated in the powder burner 10 extends from the bottom side of the combustion chamber 12, is introduced into the rotary kiln main body 1 through the connected blowing nozzle 30, and is supplied into the primary combustion chamber 4. The industrial waste is incinerated (step 5).

[0031]

According to the rotary kiln using the powder burner which uses the coated nugget chips and the like as an auxiliary fuel according to the present invention,
A fuel such as regenerated heavy oil is burned by an oil burner provided near the top of a powder burner having a substantially cylindrical combustion chamber set up in the vertical direction, and a primary fuel is injected from a primary injection port arranged near the oil burner. Air and auxiliary nugget debris serving as auxiliary fuel are injected into the combustion chamber from the tangential direction and burned while swirling in the combustion chamber. The generated flame extends from the bottom side of the combustion chamber and is connected to the combustion chamber. It is configured to be introduced into the rotary kiln by the built-in nozzle and to incinerate the industrial waste supplied into the rotary kiln, so that the residence time in the powder burner such as coated nugget debris can be easily adjusted. Can completely burn the coated nugget debris, so that the consumption of auxiliary fuel such as heavy oil can be further reduced, and the cost of industrial waste disposal can be reduced. It has the effect of it is possible.

In addition, according to the method of operating a rotary kiln using a powder burner which uses coated nugget debris or the like as an auxiliary fuel according to the present invention, similarly, the consumption of auxiliary fuel such as heavy oil can be further reduced. This has the effect that it is possible to reduce the cost of industrial waste treatment.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a rotary kiln using a powder burner that uses coated nugget waste or the like as an auxiliary fuel according to the present invention.

FIG. 2 is a side view of the powder burner and the rotary kiln shown in FIG.

FIG. 3 is a vertical sectional view of a powder burner.

FIG. 4 is a flow chart showing a method for operating a rotary kiln using a powder burner using coated nugget waste or the like as an auxiliary fuel according to the present invention.

FIG. 5 is a perspective view of a rotary kiln.

FIG. 6 is a cross-sectional view of a kiln using a conventional powder burner.

FIG. 7 is a perspective view of a conventional rotary kiln / stoker combined incinerator.

[Explanation of symbols]

A Rotary kiln using powder burner using coated nugget debris or the like as auxiliary fuel 1 Rotary kiln main body 2 Rotary furnace 2a Rail 2b Gear 3 Nozzle 3a Trump-shaped injection port 4 Primary combustion chamber 5a Roller 5c Motor 5c Pinion gear 6 Chute 6a Pusher 8 Fuel burner 10 Powder burner 12 Combustion chamber 14 Oil burner 14a Oil pump 14b Combustion air blower 15a Raw material hopper 15b Screw conveyor 15c Disk feeder 16 Coated nugget debris etc. and primary air injection port 16a Roots blower 18 Secondary air injection port 19 Air injection port 30 Blow nozzle

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Makoto Narisako 152 Yufutsu, Tomakomai City, Hokkaido Tomakomai Chemical Co., Ltd. F-term (reference) 3K061 GA04 KA02 KA13 KA21

Claims (5)

[Claims] 1. A fuel such as regenerated heavy oil is burned by an oil burner provided near a top of a powder burner having a substantially cylindrical combustion chamber set up in a vertical direction, and is disposed near the oil burner. From the primary injection port, primary air and coated nugget debris, such as metal wire-coated chips and pulverized synthetic resin, serving as auxiliary fuel, are tangentially injected into the combustion chamber and burned while swirling in the combustion chamber. The generated flame extends from the bottom side of the combustion chamber and is introduced into a rotary kiln by a blow nozzle connected thereto, and the coated nugget debris and the like for incinerating industrial waste supplied into the rotary kiln are supplemented by auxiliary fuel. Rotary kiln using a powder burner. 2. A rotary kiln using a powder burner using coated nugget debris or the like as an auxiliary fuel according to claim 1, wherein a second injection port for introducing secondary air into a combustion chamber of the powder burner; A third injection port for introducing tertiary air into the combustion chamber of the powder burner; and a rotary kiln using a powder burner that uses coated nugget debris or the like as an auxiliary fuel. 3. A rotary kiln using a powder burner using a coated nugget debris or the like as an auxiliary fuel according to claim 1 or 2, wherein the secondary air is provided in a vicinity of a substantially middle portion of a combustion chamber of the powder burner. The coated nugget, wherein the tertiary air is introduced from an axial flow direction of the blowing nozzle that connects the combustion chamber of the powder burner and the rotary kiln. A rotary kiln using a powder burner that uses waste as auxiliary fuel. 4. A rotary kiln using a powder burner using the coated nugget debris or the like as an auxiliary fuel according to any one of claims 1 to 3, wherein the coated nugget debris or the like as an auxiliary fuel is polyethylene. A rotary kiln using a powder burner that uses coated nugget debris as an auxiliary fuel. 5. A step of burning a fuel such as regenerated heavy oil by an oil burner provided near a top of a powder burner having a substantially cylindrical combustion chamber which is provided upright in the vertical direction, and disposed near the oil burner. Primary air and coated nugget debris, such as metal wire-coated chips and crushed synthetic resin, serving as auxiliary fuel, are tangentially injected from the primary injection port into the combustion chamber and swirled in the combustion chamber for combustion. Causing the secondary air to enter the combustion chamber of the powder burner from a tangential direction through a second injection port provided substantially near the middle of the combustion chamber of the powder burner; Introducing the powder burner into the combustion chamber of the powder burner from a third injection port provided near the blowing nozzle that connects the combustion chamber and the rotary kiln to the rotary kiln; Introducing the flame from the bottom side of the combustion chamber into the rotary kiln through the connected blowing nozzle, and incinerating industrial waste supplied into the rotary kiln. A method for operating a rotary kiln using a powder burner that uses coated nugget debris as an auxiliary fuel.