JPH10185158A - Spray nozzle for injecting waste liquid, and incinerator for industrial waste provided it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a spray nozzle for injecting the waste liquid which is equivalent to or more excellent than hastelloy in hydrochloric acid resistance though the nozzle is inexpensive, and can be easily manufactured. SOLUTION: A spray nozzle for injecting the waste liquid of the double pipe structure which discharges the waste liquid to be fed from an inner pipe in a spray mode by injecting the high pressure air from its tip is provided with the heat resistant vinyl chloride resin inner pipe 60 whose center part is extended in the axial direction and inside of which the waste liquid passes, and an outer pipe 70 which is arranged in a concentric manner with the inner pipe 60 and around the inner pipe 60, and passes the high pressure air in a space between an outer circumferential surface of the inner pipe 60 and the outer pipe, and at least the tip part of which consists of the heat resistant and wear resistant material.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention generally relates to a spray nozzle for injecting waste liquid used in an industrial waste incinerator and an industrial waste incinerator provided with the spray nozzle. TECHNICAL FIELD The present invention relates to a spray nozzle for industrial use and an industrial waste incinerator provided with the spray nozzle.

The waste liquid injected into the industrial waste incinerator according to the present invention includes, for example, a fermentation waste liquid containing a large amount of hydrochloric acid from a sodium glutamate production plant, a factory waste liquid such as a plating waste liquid, and a waste liquid from a printed circuit board production plant. Waste acids containing metals,
Waste acids from gravure printing plants.

[0003]

2. Description of the Related Art Conventionally, waste liquid containing hydrochloric acid has been burned as an industrial waste in an industrial waste incinerator. Wastewater containing hydrochloric acid contains chlorine groups, which causes dioxin generation. Therefore, the waste liquid is designed to be burned at a position having an in-furnace temperature of 700 ° C. or higher, at which Diokin is considered to be completely decomposed.

In a stoker / rotary kiln combined furnace, a waste liquid injection nozzle is installed just before the secondary combustion chamber above the stoker furnace. In a fluidized bed incinerator, the inside of the furnace is heated to 900 ° C. by using an auxiliary burner or the like. After maintaining the above high temperature, a waste liquid injection nozzle is installed near the furnace top.

FIG. 4 is a longitudinal sectional view of such a conventional typical waste liquid jet nozzle. The waste liquid injection nozzle 30 is roughly composed of an inner tube 34, an outer tube 32 arranged around the inner tube 34, and a nozzle set 33 attached to a tip of the outer tube 32.
And is configured. The waste liquid is supplied from the supply port 38 to the inner pipe 34.
Through the tip. The high-pressure air supplied from the supply port 37 passes through the gap between the outer pipe 32 and the inner pipe 34,
The flow rate of the air is increased by the throttle portion 33 a provided in the nozzle set 33. The waste liquid discharged from the inner pipe 34 by the high-speed air is stirred in the mixing chamber 33b. Then, the liquid is sprayed from a plurality of small holes 33c provided at the tip of the nozzle set 33.

By the way, such a waste liquid injection nozzle 30
If the waste liquid to be injected is a waste liquid containing sulfuric acid or nitric acid, austenitic stainless steel or M
Sufficient corrosion resistance is exhibited even when manufactured with an alloy containing a small amount of o, Cu, or the like. However, if a waste liquid containing hydrochloric acid, which is a non-oxidizing acid, is used in the waste liquid injection nozzle 30 made of such an alloy, corrosion occurs relatively early.
In such a case, Hastelloy (trade name, Haynes Stelli, USA), which is a Ni-based alloy and excellent in hydrochloric acid resistance, is used.
te Co. , Manufacturing and sales) is used in contact with the waste liquid, for example, the entirety of the inner tube 34 and the waste liquid injection nozzle 30 used for the nozzle set 33.

[0007]

As described above, the conventional waste liquid injection nozzle 30 using Hastelloy has a high manufacturing unit price due to the high price of Hastelloy, and the nozzle set 33 has a high cost. Such a complicated shape could not be produced due to the problem of machinability and had to be cast. The manufacturing unit price of the vigorous nozzle set 33 also increased, and the spray state of the waste liquid to be sprayed was constant and could not be adjusted because of the relatively simple shape.
That is, as shown in the illustrated nozzle 30 for ejecting waste liquid,
The inner tube 34 is a straight tube whose tip portion 34a is slightly narrowed, and is fixedly attached to the outer tube 32. Further, the spray state of the waste liquid is determined only by the shape, number and arrangement of the small holes 33c formed in the nozzle set 33.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a spray nozzle for injecting a waste liquid, which can be manufactured inexpensively and easily and has a hydrochloric acid resistance equivalent to or better than Hastelloy.

Another object of the present invention is to provide a spray nozzle for discharging waste liquid which can adjust the spraying state of the waste liquid in accordance with the combustion state in the furnace and always enable ideal combustion. .

A further object of the present invention is to provide an industrial waste incinerator which can incinerate any kind of waste acid by providing such a spray nozzle for injecting waste liquid.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an inner tube made of a heat-resistant vinyl chloride resin, which extends in a central portion in an axial direction and through which waste liquid passes, and an inner tube. And an outer tube made of a material having heat resistance and abrasion resistance, at least a tip portion of which is arranged coaxially with and around the inner tube, and has a high-pressure air passing between the outer tube and the outer peripheral surface of the inner tube. Provided is a spray nozzle for discharging waste liquid having a double pipe structure that discharges waste liquid supplied from an inner pipe by spraying high-pressure air from a tip end.

[0012] Vinyl chloride resin is a material which is excellent in acid resistance and inexpensive. In this type of industrial waste incinerator, the waste liquid passing through the inside is used at a temperature lower than the thermal decomposition temperature of the vinyl chloride resin, and therefore has sufficient heat resistance as a material for the inner tube.

The high-pressure air passing between the outer peripheral surface of the inner tube and the outer tube serves to cool the inner tube and protects the inner tube made of vinyl chloride resin from the high temperature in the furnace.

According to a second aspect of the present invention, in the spray nozzle for ejecting a waste liquid according to the first aspect, the inner pipe includes an inner tip piece having a complicated shape and an inner straight pipe piece having the same cross section in the axial direction. It is characterized by comprising.

In order to precisely control the spray state of the waste liquid, the vicinity of the tip of the inner tube must be formed in a predetermined shape. By forming the inner tip piece and the inner straight pipe piece as separate members, the complicated shape portion can be manufactured separately and independently from other portions having a simple shape.

According to a third aspect of the present invention, in the spray nozzle for ejecting a waste liquid according to the second aspect, the inner tip piece integrally has a swirl vane for swirling high-pressure air passing through the outer periphery on its outer peripheral surface. It is characterized by having.

The swirl vanes integrally formed on the outer periphery of the inner tip piece swirl the high-pressure air passing outside thereof.
Thus, when the high pressure air is injected from the tip, the high pressure air involves the waste liquid supplied from the inner tube and is discharged in a swirling state in the form of spray. That is, the spray-like waste liquid is rapidly atomized because it moves at a high speed in the axial direction and has a rotational movement.

According to a fourth aspect of the present invention, in the spray nozzle for ejecting a waste liquid according to the third aspect, the outer tube is made of a stainless steel outer straight piece having the same cross section in the axial direction as the outer tip piece made of a fluororesin. And a tube piece.

By forming the outer tip piece and the outer straight pipe piece as separate members, it is possible to provide a heat-resistant and abrasion-resistant material and to manufacture a complicated-shaped portion separately and independently from other portions having a simple shape.

According to a fifth aspect of the present invention, in the spray nozzle for discharging a waste liquid according to the fourth aspect, the outer tip piece has a central through hole whose dimensions are precisely controlled according to the outer shape of the inner tip piece. It is characterized by having.

Since the central through-hole of the outer tip piece has a size following the outer shape of the inner tip piece, when high-pressure air is injected from the tip, the high-pressure air removes waste liquid supplied from the inner pipe. It is discharged in a spray state in an ideal state while being involved.

According to a sixth aspect of the present invention, in the spray nozzle for discharging a waste liquid according to the fifth aspect, the inner pipe is attached to the outer pipe so as to be reciprocally movable by a predetermined distance in the axial direction. Thus, the spray shape of the discharged waste liquid can be arbitrarily changed.

By changing the relative position of the inner tube and the outer tube in the axial direction, the gap between the inner tube and the outer tube at the distal end changes. This changes the speed of the high-pressure air injected from the tip, thus changing the shape of the spray of waste liquid from the inner tube.

According to a seventh aspect of the present invention, there is provided an industrial waste incinerator provided with the waste liquid spraying nozzle according to any one of the first to sixth aspects, wherein an outer dimension of the waste liquid spraying nozzle is provided. A mounting hole having an inner dimension slightly larger than that of the mounting hole is drilled in the furnace body, and the waste liquid spraying nozzle is mounted around the entire circumference of the furnace so as to be spaced apart from the inner wall surface of the mounting hole. An industrial waste incinerator characterized in that secondary air for in-furnace combustion is supplied through a space formed between an injection spray nozzle and the mounting hole.

The secondary air for in-furnace combustion supplied into the furnace through a space formed between the waste liquid spraying nozzle and the mounting hole is supplied to the outer pipe of the waste liquid spraying nozzle,
In particular, it protects the outer tip piece closest to the furnace from the high temperatures in the furnace.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a spray nozzle for injecting a waste liquid and an industrial waste incinerator having the spray nozzle according to the present invention will be described in detail with reference to the drawings. FIG. 2 shows an embodiment of a fluidized bed incinerator 1 provided with a spray nozzle 50 for ejecting waste liquid according to the present invention. Of course, industrial waste incinerators include other types of incinerators, such as rotary kiln-type incinerators, stoker-type incinerators, rotary hearth-type incinerators, and other acids containing hydrochloric acid (can also be used for general wastewater). Any type of incinerator may be used as long as it is injected into the furnace and burned.

In the preferred embodiment shown,
The fluidized bed incinerator 1 has a furnace main body 10 having a substantially circular cylindrical cross section. The furnace body 10 includes a furnace top 10.
a is about 10 m from the hearth 10b to the hearth 10b.
The diameter D1 of Ob is 3 m and the height H1 is 0.6 m. The diameter D2 of the lower part 10c of the furnace body 10 is 4 m,
The height H2 from b to the upper end of the lower part 10c is 4 m.
The diameter D3 of the upper part 10d of the furnace body 10 is 6.5 m, and the height H3 from the furnace top 10a to the lower end of the upper part 10d is 6 m.

A large number of air holes 10e are formed in the hearth 10b, and fluidized air is introduced into the furnace body 10 through the air holes 10e. The diameter of the air hole 10e is 6
It is preferable that they are formed at a distance of 100 to 150 mm from each other. In this embodiment, the amount of fluidizing air supplied into the furnace main body 10 through the air holes 10e is 110
In Nm ³ / min, that of the case of using silica sand as a fluidized bed since it is 150 Nm ³ / min, can be reduced fluidizing air volume per minute 40 Nm ³ / min. This is because, as will be described later, solids and / or residues contained in sludge lighter than silica sand flow and deposit above the hearth 10b. Alkaline components such as Na and K are discharged from the furnace as fly ash together with the steam gas and collected by an electric dust collector. Therefore, there is no problem such as corrosion of the bricks in the furnace due to alkali and generation of a molten material.

The solid content and / or the residue thereof contained in the relatively light sludge flows well by air from below. Thereby, the aggregate of the solid content and / or the residue contained in the sludge fluidized and deposited on the hearth forms a fluidized bed of a desired thickness.

In the fluidized bed incinerator 1, since a target to be incinerated is selected, large solid residues are not generated in the hearth, and the fluidized bed is well stirred. The residue is finely divided by abrasion in the fluidized bed and is accompanied by waste gas to form fly ash, and the entire amount is collected by an electric dust collector. Therefore, basically, it is not necessary to extract the residue from the fluidized bed, but it is also possible to extract a part of the residue in a batch. Thereby, there is an advantage that the shutdown of the furnace can be eliminated or the number thereof can be greatly reduced.

In the lower part 10c of the furnace body 10, two to five burners 16 as auxiliary combustion means are installed at equal intervals in the circumferential direction. As fuel for the burner, in addition to heavy oil, recycled oil from waste oil or the like can be used. The on / off of the burner 16 is appropriately controlled while measuring the temperature of the combustion gas in the furnace main body 10 with a sensor (not shown) and the supply amount of another heat compensation source such as waste plastic.

In the lower part 10c of the furnace body 10, a waste acid containing hydrochloric acid (a waste alkali containing an alkali component such as Na or K, or a waste acid other than hydrochloric acid can also be used).
Two to five injection nozzles 50 according to the present invention for injecting into 0 are installed at equal intervals in the circumferential direction. The injection nozzle 50 is provided so that the waste liquid injected therefrom is efficiently dried and burned by the fuel injected from the burner 16.
It is provided above.

FIG. 1 is a longitudinal sectional view of one embodiment of the injection nozzle 50. The injection nozzle 50 is generally fixed to an inner tube 60 and an outer tube 70 having a double tube structure, a spacer 80 inserted therebetween, and fixed to a side of the outer tube 70 opposite to the distal end side. And a sealing member 90 that supports the inner tube 60 that penetrates the central portion so as to be slidable in the axial direction.

The inner pipe 60 has an inner tip piece 62 having a complicated shape, an inner straight pipe piece 64 having the same cross section in the axial direction, and a pipe socket 66 connecting the two. A connection pipe 67 with a flange for connecting to a waste liquid supply source (not shown) is connected to a side of the inner pipe 60 opposite to the distal end side through a socket of a different diameter. All of these parts that come into contact with the waste liquid are made of heat-resistant vinyl chloride resin. Vinyl chloride resin is an inexpensive material that is excellent in acid resistance to almost all acids including hydrochloric acid. In this kind of industrial waste incinerator, the waste liquid that passes through the inside is used at a temperature of 150 ° C or less, which is the thermal decomposition temperature of vinyl chloride resin, and actually at 20 to 50 ° C. Will have the property.

In order to precisely control the spray state of the waste liquid, the vicinity of the tip of the inner tube 60 must be formed in a predetermined shape. By forming the inner tip piece 62 and the inner straight pipe piece 64 as separate members, the complicated shape portion can be manufactured separately and independently from the other portions having the simple shape.
Thereby, the manufacturing cost of the entire inner tube 60 can be significantly reduced. On the outer peripheral surface of the inner tip piece 62,
A plurality of revolving blades 62a are integrally formed. As described above, since the inner tip piece 62 is also made of vinyl chloride resin, the formation of the revolving blade 62a can be performed easily and precisely. The high-pressure air passing through the outer periphery of the inner tip piece 62 is swirled by the swirling blade 62a.
Accordingly, when high-pressure air is injected from the tip of the injection nozzle 50, the high-pressure air entrains the waste liquid supplied from the inner pipe 60 and is discharged in a swirling state in a spray state. That is, the spray-like waste liquid has the effect of moving at a high speed in the axial direction and being rapidly atomized due to the addition of the rotational movement.

The high-pressure air passing between the outer peripheral surface of the inner tube 60 and the outer tube 70 serves to cool the inner tube 60 and to reduce the temperature of the furnace tube 10 from the high temperature inside the furnace tube 10.
Protect 0.

The outer tube 70 is disposed coaxially with the inner tube 60 so as to form a predetermined gap around the inner tube 60 with the spacer 80 and the sealing member 90. Outer tube 70
Is connected to an outer tip piece 72 made of a fluorine resin, for example, a heat-resistant Teflon resin, an outer straight pipe piece 74 made of stainless steel having the same cross section in the axial direction, and a high-pressure air source (not shown). Flanged pipe 7
8 and a connection pipe 76 made of stainless steel fluidly connected to the connection pipe 8. In the preferred embodiment shown, the outer tip piece 72 and the outer straight pipe piece 74 are screwed together, while the outer straight piece 74 and the connecting pipe 76 are welded.

Since the outer tip piece 72 is made of a heat-resistant Teflon resin, which is a material having wear resistance, even if high-pressure air and waste acid pass through the central through-hole 72a at high speed and in a turbulent manner, the outer tip piece 72 withstands sufficiently. Obtainable. By forming the outer tip piece 72 and the outer straight pipe piece 74 and the like as separate members, the outer tip piece 72 having heat resistance and abrasion resistance and having a complicated shape can be separately and independently provided from other portions having a simple shape. Can be manufactured.

Center through hole 72a of outer tip piece 72
Has a size following the outer shape of the inner tip piece 62. Thus, when high-pressure air is injected from the tip of the injection nozzle 50, the high-pressure air is discharged in a spray state in an ideal state while involving the waste liquid supplied from the inner pipe 60.

As shown, the injection nozzle 50 of the present invention is provided with a mounting hole 1 formed in the wall of the fluidized bed incinerator 1.
0f. The mounting hole 10f has an inner dimension slightly larger than the outer dimension of the injection nozzle 50. The injection nozzle 50 is attached so as to be spaced substantially equally from the inner wall surface of the attachment hole 10f over the entire circumference. Secondary air for in-furnace combustion is supplied through a space formed between the injection nozzle 50 and the mounting hole 10f.

With this configuration, the secondary air for furnace combustion supplied into the furnace through this space causes the outer tube 70 of the injection nozzle 50, particularly the outer tip piece 72 closest to the furnace to reach the high temperature inside the furnace. Protect from. Generally, the in-furnace temperature of this type of fluidized bed incinerator 1 is 800 ° C. or more. However, the protection and cooling by the secondary air can sufficiently withstand the production of the outer tip piece 72 from heat-resistant Teflon resin. Becomes

The sealing member 90 has a stainless steel flange 92 for sealing one end of the connection pipe 76, and a stainless steel bush 94 disposed inside the flange 92. The sealing socket 69 fixed to a predetermined position on the outer peripheral surface of the inner straight pipe piece 64 by an adhesive is slidably attached to the bush 94. Thus, the inner pipe 60 is attached to the outer pipe 70 so as to be able to reciprocate a predetermined distance in the axial direction, and thereby,
The spray shape of the discharged waste liquid can be arbitrarily changed. That is, when the relative position of the inner tube 60 and the outer tube 70 in the axial direction is changed, the gap between the inner tube 60 and the outer tube 70 at the distal end changes. As a result, the speed of the high-pressure air injected from the tip changes, and accordingly, the shape of the spray of the waste liquid from the inner pipe 60 changes.

Referring again to FIG. 2, an inlet 20 for introducing waste plastic into the furnace body 10, an injection port 20 for injecting waste liquid and sludge into the furnace body 10 are provided at the furnace top 10 a of the furnace body 10. A nozzle 22 is provided.

As shown in FIG. 3, the waste plastic is preferably pre-treated before being supplied to the fluidized bed incinerator 1 as a heat compensation source. In the industrial waste treatment system shown in FIG. 3, waste plastic is collected in a waste plastic pit 2. This is pulverized into coarse particles of several mm to 50 mm by the waste plastic pulverizer 3, and the pulverized particles are put into the furnace body 10 through the input port 20 using, for example, a screw conveyor. Those having a large particle diameter are separated from the furnace body 1 by a double damper (not shown) separately provided on the furnace top 10a.
It can also be put in 0. Fine powder of 1 mm or less is separated using, for example, a cyclone or a bag filter.
The injection nozzle 2 passes through a path indicated by a dotted line in the drawing.
2 mixed in the sludge. Thereby, it is possible to prevent the fine powder waste plastic from being directly introduced into the furnace main body 10 and overburning, that is, preventing explosion.

As shown in FIG. 2, the injection nozzle 22 has a triple tube structure made of SUS304. The same waste liquid as described above is supplied into the central inner pipe 22a, high-pressure air is supplied to the intermediate pipe 22b disposed outside the inner liquid, and further to the outer pipe 22c disposed outside the intermediate pipe 22b. Is supplied with sludge containing combustible solids such as activated sludge. As described above, the sludge supplied into the outer pipe 22c may be mixed with finely-purified waste plastic. In the present embodiment, the outer diameter d1 of the outer tube 22c is set.
Was about 125 mm, the nozzle tip was tapered, and the injection port diameter d2 at the nozzle tip was 80 mm. In such a configuration, for example, high-pressure air of 3 to 4 kg / cm ² is supplied to the intermediate pipe 2.
When injected into the furnace body 10 from 2b, 0 to 1 kg / cm
^The waste liquid supplied to the inner pipe 22a at the pressure of ² is also injected into the furnace body 10 in the same manner as the high-pressure air. As a result, the outlet of the injection nozzle 22 violently collides with the sludge supplied from the outer pipe 22c.

Therefore, the sludge injected into the furnace body 10 is dispersed in the furnace body 10. It is preferable that the sludge is uniformly dispersed in the furnace. For this reason, it is preferable that the injection nozzle 22 be inclined so as to face substantially the center of the upper space 10d of the furnace body 10. This inclination angle θ
Is about 13 ° in the illustrated embodiment, but good results could be obtained. In addition to the first injection nozzle 50 described above, a second injection nozzle 50 capable of supplying only waste liquid into the furnace can be provided in the upper part 10d of the furnace main body 10 as needed, in addition to the first injection nozzle 50 described above.

In this embodiment, the furnace body 1
The waste plastics put into the chamber 0 are various plastics such as polyethylene and acrylic, but are pulverized to 1 to 50 mm so as to be easily burned in the furnace as described above. Therefore, in the present invention, the waste plastic charged into the furnace functions as a fuel for heat compensation. Similarly, the finely divided waste plastic mixed in the sludge supplied from the outer pipe 22c of the injection nozzle 22 functions as a fuel when moisture is removed and dried. Such fine powder waste plastic is mixed into the sludge and charged into the furnace main body 10, so that it is dried little by little with time, so that rapid combustion and explosion do not occur. The waste plastic from the inlet 20 is supplied by a screw conveyor (not shown), and the supply amount is appropriately adjusted according to the required combustion amount. The waste liquid is most effective when it is a waste acid containing hydrochloric acid. However, a waste liquid containing alkaline components such as Na and K, such as a scrubber cleaning liquid and a plating waste liquid generated in a factory, may be used. Moreover, these are usually COD (Chemical OxygenD).
emand) is 2000 to 100,000 ppm. Also,
The sludge was activated sludge containing various organic substances such as sewage sludge.

Next, the operation of the fluidized bed incinerator 1 having the above configuration will be described. Fluidized air is supplied through the air hole 10e at a flow rate of 110 Nm ³ / min as described above.
Introduce into 0. When the burner 16 is ignited and the vicinity of the hearth 10b is heated, moisture in the sludge is removed, and the hearth 10b is heated.
Only solids deposit on top. This set of solids is levitated and fluidized by the fluidizing air passing through the air holes 10e and burns to form a fluidized bed of about 1.5 m. As the fuel used for the burner 16, a mixture of regenerated oil and waste oil can be used.

According to the present embodiment, the components constituting the fluidized bed are combustible solids and / or residues contained in the sludge, and are lighter than conventional silica sand.
There is an advantage that the amount of fluidizing air introduced into the furnace through the air holes 10e can be reduced. Furthermore, there is an advantage that the heat energy required for raising the temperature to the predetermined temperature by the amount of the fluidized air is not required as compared with the conventional system.

As will be described later, the waste plastic introduced into the furnace from the furnace top 10a is thermally decomposed and burned, and further, unburned gas generated by hydrolysis of waste liquid, sludge, and the like is removed from the furnace. By burning in the furnace, the furnace body 10
The inside is heated. Thus, the furnace body 1 including the fluidized bed
The lower part 10c of 0 is about 800 ° C., and the upper part 10d is 9 ° C.
The temperature is raised to a temperature of 00 to 1000 ° C.

According to the present embodiment, the sludge which is vigorously injected with high-pressure air from the injection nozzle 22 and is uniformly dispersed in the furnace is also injected from the waste liquid and the injection port 20 which are also violently injected with the high-pressure air from the injection nozzle 22. The burned waste plastic is completely dried in the upper part 10d of the furnace body 10, and the solid content is thermally decomposed in the lower part 10c. As a result, the unburned gas is burned as a heat source in the upper part 10d, and the unburned gas is discharged from an exhaust gas discharge port 26 formed in the furnace top 10a into an exhaust gas treatment facility, for example, a waste heat boiler 4 as shown in FIG. It is sent to a dust device 5, a wet-type harmful gas removing device, and the like. Further, the waste liquid injected from the first and second injection nozzles 50 also completely evaporates moisture and the like due to the heating of the combustion gas in the upper part 10d and the high temperature atmosphere in the lower part 10c, and the remaining solid content is thermally decomposed. . The unburned gas generated by this is also burned in the furnace main body 10.

According to the present embodiment, the inner tube 60 is
Is mounted so as to be able to reciprocate by a predetermined distance in the axial direction, so that the spray shape of the discharged waste liquid can be arbitrarily changed. Therefore, the waste liquid can be supplied into the furnace and burned in an optimum spray state while observing the combustion state in the furnace.

(Embodiment) The processing system shown in FIG.
Waste liquid (waste acid, waste alkali) 1550 tons / month, sludge (activated sludge) 355 tons / month, waste plastic 230 tons / month
Month processing was possible. In this case, the amount of residue discharged from the furnace bottom is 30 tons / month, and the volume reduction rate is about 1.5%
Was able to achieve.

The amount of fluidized air blown from the air hole 10e into the hearth 10b and the amount of high-pressure air blown from the intermediate pipe 22b of the spray nozzle 22 are 110 Nm ³ / min and 20 Nm.
^{At a} rate of ³ / min, the waste plastic introduced into the furnace from the inlet 20 is from several mm to 50 mm, and waste plastic of a size smaller than that is mixed into the sludge injected into the furnace from the outer tube 22c of the injection nozzle 22. . When the temperature in the furnace was measured, the temperature was 800 ° C. in the hearth 10b, and 900 to 100
It was 0 ° C. The amount of exhaust gas discharged from the exhaust gas discharge port 26 is 180 to 200 Nm ³ / min, which is larger than the air supply amount into the furnace by the amount of water vaporized and the amount of combustible exhaust gas such as waste plastic. Was. Carbon monoxide (CO) and oxygen (O2) in the exhaust gas are each 0.1%.
The air volume was adjusted to be 002 to 0.003% and 4 to 13%. This is because when carbon monoxide (CO) exceeds 0.01%, oxygen is insufficient and residues increase.

[0055]

The spray nozzle for spraying waste liquid according to the present invention has an inner pipe made of heat-resistant vinyl chloride resin extending axially in the center and through which waste liquid passes, and coaxially with the inner pipe. An outer tube made of a material having heat resistance and abrasion resistance is provided at least at a distal end thereof, which is disposed around the inner tube and allows high-pressure air to pass between the inner tube and the outer peripheral surface of the inner tube. Since the waste liquid supplied from the inner tube is discharged in the form of a spray by injecting high-pressure air, the waste liquid has a hydrochloric acid resistance equivalent to or better than Hastelloy, although it can be manufactured inexpensively and easily. It has the advantage that a spray nozzle for injection can be provided.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an embodiment of a waste liquid spray nozzle according to the present invention.

FIG. 2 is a longitudinal sectional view showing one embodiment of a fluidized bed incinerator provided with a spray nozzle for ejecting waste liquid according to the present invention.

FIG. 3 is a schematic diagram of an industrial waste treatment system including the fluidized bed incinerator of FIG. 2;

FIG. 4 is a longitudinal sectional view of a conventional typical waste liquid injection nozzle.

[Description of Signs] 1 Fluidized bed incinerator 2 Waste plastic pit 3 Waste plastic crusher 4 Waste heat boiler 5 Electric precipitator 10 Furnace main body 10a Furnace top 10b Furnace floor 10c Lower 10
d upper part, 10e air hole, 10f mounting hole 16 burner 20 inlet 22 injection nozzle 22a inner pipe, 22b intermediate pipe, 22c outer pipe 26 exhaust gas discharge port 50 injection nozzle 60 inner pipe 62 inner tip piece 62a swirl vane 64 inner straight pipe Piece 66 pipe socket 70 outer pipe 72 outer tip piece 72a central through hole 74 outer straight pipe piece 80 spacer 90 sealing member

[Procedure amendment]

[Submission date] February 12, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0053

[Correction method] Change

[Correction contents]

(Embodiment) The processing system shown in FIG.
Waste liquid (waste acid, waste alkali) 1550 tons / month, sludge (activated sludge) 355 tons / month, waste plastic 230 tons / month
Month processing was possible. In this case, the amount of residue discharged from the furnace bottom is 30 tons / month, and the volume reduction rate is about 98 . 5
% Could be achieved.

Claims (7)

[Claims] 1. An inner tube made of heat-resistant vinyl chloride resin extending axially through a center portion and through which waste liquid passes, and disposed coaxially with and around the inner tube. An outer pipe made of a material having heat resistance and abrasion resistance at least at the tip end of which passes high-pressure air between the outer pipe and the outer peripheral surface of the pipe. Spray nozzle for spraying waste liquid with a double pipe structure that discharges the waste liquid to be sprayed. 2. The spray nozzle for ejecting waste liquid according to claim 1, wherein the inner pipe includes an inner tip piece having a complicated shape and an inner straight pipe piece having the same cross section in the axial direction. A spray nozzle for ejecting waste liquid, characterized in that: 3. The spray nozzle for discharging a waste liquid according to claim 2, wherein the inner tip piece integrally has a swirl vane on its outer peripheral surface for swirling high-pressure air passing through its outer periphery. A spray nozzle for ejecting waste liquid. 4. The spray nozzle for ejecting waste liquid according to claim 3, wherein the outer pipe includes an outer tip piece made of a fluororesin and an outer straight pipe piece made of stainless steel having the same cross section in the axial direction. A spray nozzle for ejecting waste liquid, wherein the spray nozzle is configured. 5. The spray nozzle for ejecting waste liquid according to claim 4, wherein the outer tip piece has a central through-hole precisely controlled in size according to the outer shape of the inner tip piece. Spray nozzle for waste liquid injection. 6. The spray nozzle for ejecting waste liquid according to claim 5, wherein the inner pipe is attached to the outer pipe so as to be able to reciprocate a predetermined distance in an axial direction with respect to the outer pipe, thereby discharging the liquid. A spray nozzle for injecting waste liquid, wherein the spray shape of the waste liquid can be arbitrarily changed. 7. An industrial waste incinerator provided with a spray nozzle for ejecting waste liquid according to claim 1, wherein an inner diameter of the incinerator is slightly larger than an outer dimension of the spray nozzle for ejecting waste liquid. While drilling a mounting hole with dimensions in the furnace body,
Attaching the waste liquid spraying nozzle over the entire circumference so as to be spaced from the inner wall surface of the attachment hole,
An industrial waste incinerator characterized in that secondary air for in-furnace combustion is supplied through a space formed between the spray nozzle for waste liquid injection and the mounting hole.