JPH10176172A - Process and apparatus for recovering solid with jet burner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process and an apparatus for recovering solids with a jet burner, whereby the oil is removed from the oily solid left after being discharged from the jet burner of a treatment tank and subjected to separation with a solid/gas separator, and the respective solid components are recovered from the slid comprising a plurality of types of solid components. SOLUTION: An object to be treated 13 is dried by treatment with a hot gas injected from a jet burner 2 provided on a treatment tank, and a waste gas transformed from the hot gas deprived of energy by the treatment and solids formed as a result of drying and grinding of the object are recovered. By virtue that the oily solid after being separated from a solid/gas separator 17 has a sufficiently high temperature, oxygen is fed into the solids to spontaneously burn and remove the adherent oil from the solid.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process in which a hot gas spouted from a jet burner provided in a processing tank is sprayed onto a target object in a non-oxidizing atmosphere to dry and pulverize the object. In the treatment, the exhaust gas in which the gas generated from the handled material and the gas in which the hot gas has changed are mixed, and the solid matter is solid-gas separated by solid-gas separation means by solid-gas separation means formed by drying and pulverizing the handled material. The present invention relates to a method and an apparatus for recovering solids, and more particularly to a method and an apparatus for recovering solids by a jet burner that removes oil adhering to solids that have been solid-gas separated by solid-gas separation means.

[0002]

2. Description of the Related Art As a conventional apparatus for treating oily waste using a jet burner, there is one proposed in Japanese Patent Application Laid-Open No. Hei 7-275897.

[0003] In this prior art, 1000 to 2000 containing almost no oxygen after complete combustion from a jet burner 2 installed above a treatment tank 1 having a closed structure shown in FIG.
The combustion gas of 0 ° C. is ejected, and oily waste such as petroleum sludge and waste oil is conveyed from the handled material receiving tank 14 to the treatment tank 1 by the screw conveyor 16, and is brought into contact with the combustion gas ejected from the jet burner 2. The solid matter in the oily waste is dried and pulverized at a high speed with high-temperature energy to evaporate oil, gas or moisture, and the dried and pulverized and vaporized matter is kept at 300 to 500 ° C. to obtain a solid-gas separator. At 17, the vaporized material is physically separated into a solid matter, and the vaporized matter is cooled by the condenser 21 to be liquefied with oil, and the solid matter is collected in the collecting container 38.

[0004] In this way, without burning the oily waste, it is smokeless and odorless, and the oily waste can be removed from the oily waste in a short time.
Moisture and solids are separated efficiently.

[0005]

In the above prior art,
High-temperature hot gas spouted from the jet outlet of the jet burner 2 in the treatment tank 1 is converted into the object to be treated (oily waste or handled material).
When the object to be treated is oily waste, oil is vaporized, and when the object is water-containing, moisture is vaporized.

[0006] In the process, oil or moisture gradually evaporates when the object to be treated comes into contact with high-temperature hot gas. Then, the oil or water directly adhering to the solid matter is also gradually removed and becomes granular. Depending on the processing target, there are a plurality of types of solids, and a plurality of granular solids are present in the processing tank 1. After the high-temperature hot gas is repeatedly circulated in the processing tank 1, an airflow reaching the discharge port as exhaust gas is formed. The solidified particles float in accordance with the airflow, are discharged from the outlet together with the exhaust gas, the vaporized oil or vaporized vapor, and reach the solid-gas separator 17 via a conduit.

[0007] Granular solids are discharged from the processing tank 1 not when oil or water is completely removed, but
Since it is just the point at which it can be suspended by the airflow, a certain amount of oil or moisture is attached to the solid matter that has reached the solid-gas separator 17. Even if the temperature, airflow velocity, and airflow amount in the processing tank 1 are strictly controlled, there are multiple types of solids, or even if they are single types, the shapes of the solids differ from one particle to another. Therefore, it is extremely difficult to eliminate any oil or water attached to the solid matter discharged from the discharge port.

[0008] The present inventors have confirmed through experiments that oil has adhered to solids.

The solid-gas separator 17 is usually a device that simply physically separates a solid from a gas. Therefore, the solid matter collected from the solid-gas separator 17 is collected with a certain amount of oil or moisture attached.

The fact that the solid is not a single kind or contains a certain amount of oil or moisture, especially containing a trace amount of oil, makes it difficult to reuse the solid in other industrial fields. Or a significant impediment to the return to the natural world, which in turn leads to the creation of new waste.

An object of the present invention is to remove oil from solids discharged from a treatment tank of a jet burner and separated by a solid-gas separator, and further, from solids composed of a plurality of types. Another object of the present invention is to provide a method and an apparatus for collecting solids by a jet burner which can collect a single kind of solids and collect solids having a useful value.

[0012]

A feature of the present invention that achieves the above object is that a hot gas ejected from a jet burner provided in a processing tank is sprayed on a target object in a non-oxidizing atmosphere. A process of drying and pulverizing the handled material is performed, and an exhaust gas in which a gas generated from the handled material in the process and a gas in which the hot gas is changed is mixed and a solid material obtained by drying and grinding the handled material is solidified. A solid-gas separation unit for collecting solids by gas-separation means, wherein the solids are oxidized while maintaining the thermal energy obtained from the hot gas ejected from the jet burner after the solid-gas separation. Guided under an atmosphere, the oil adhering to the solid is removed by oxidizing and evaporating the oil, or the solid is contacted with an organic solvent after the solid-gas separation to remove the oil adhering to the solid. solvent It is to washed away.

[0013] Furthermore, when a part of the solid is a salt, the oil attached thereto is removed, and then the solid is washed with water.
It is to remove salt from the solid.

A feature of the apparatus of the present invention that achieves the above object is an apparatus for performing the above-described method of the present invention.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a method and an apparatus for recovering solids by a jet burner according to the present invention will be described with reference to the drawings.

FIG. 1 shows a first embodiment of the present invention, and FIG. 2 shows a processing situation in a processing tank 1.

In both figures, a jet burner 2 provided above a processing tank 1 has a combustion chamber provided with a passage for cooling water 9 between an inner wall and an outer wall, and compressed air 7 and fuel The hot gas 4, which is burned by injecting the combustion gas 8 and hardly contains the burned oxygen, is supplied to the jet port 11 at the lower portion of the combustion chamber.
From the flame jet stream 3. The temperature of the hot gas body 4 ejected at the ejection port 11 is about 1000 to 2000
C., and the flow rate has a high energy of about 3 Mach.

The oily waste or the hydrated material, which is the handled material 13, is transferred from the received material receiving tank 14 to the screw conveyor 16.
Is supplied into the flow of the hot gas 4 in the processing tank 1 and is exposed to the hot gas 4 jetted from the jet burner 2, whereby the oil or moisture gradually evaporates to be dried and crushed,
The solid 6 partially contains oil or water. The vaporized oil or moisture is mixed with the altered hot gas 4 to become exhaust gas 5. Solid matter 6 is exhaust gas 5 flowing in processing tank 1.
To start floating in the processing tank 1. Whether or not to start floating firstly depends on the flow velocity distribution of the exhaust gas 5 formed in the processing tank 1,
Secondly, the size is determined by the projected area of the solid matter shape in the handled material 13, and thirdly, the weight per block of the solid matter 6 containing oil. When the oil or moisture in one lump is vaporized and lightened, and the lump is crushed and the solid becomes granular and further lightened, it starts to float in the treatment tank 1 and reaches the discharge port 12 and, together with the exhaust gas 5, passes through the conduit 37a. Gas-solid separator 17
Leads to.

The exhaust gas 5 separated by the solid-gas separator 17 is
The filter 19 is reached via a conduit 37b.

The filter 19 removes fine particles in the exhaust gas 5 that cannot be separated by the solid-gas separator 17 and removes the removed particles through an oil removing means 18 provided below the solid-gas separator 17 via a conduit 37d. Return to On the other hand, the filter 19
The exhaust gas 5 that has passed through reaches the wet condenser 20 via the conduit 37c.

The wet condenser 20 has a temperature of about 6
In order to cool to about 0 to 150 ° C., oil and water in the exhaust gas 5 condense and liquefy. 39a is a circulation pump. Water, nitrogen, carbon dioxide, and the like, which are not condensed by the wet condenser 20, are discharged into the atmosphere via the conduit 37e as a gas. The oil and water liquefied by the wet condenser 20 reach the separation tank 22 via the conduit 37f.

In the separation tank 22, the oil 41 in the upper layer and the water 42 in the lower layer are separated and collected. The pump 39b is for collecting the water 42.

FIG. 3 shows that the material to be handled 13 is a mixture of sand and salt containing oil.
The oil removing means 18 for removing the oil attached to the solid by combustion (oxidation and vaporization) of the solid obtained in 9 is shown.

The solid 6 which is a mixture of sand and salt containing oil, which is an object to be treated, is charged into a combustion chamber 23 of an oil removing means 18 provided downstream (at the subsequent stage) on the solid side of the solid-gas separator 17.
The temperature of the object to be treated (solid matter 6) is about 300 to 600 ° C. slightly lower than the temperature in the treatment tank 1. Combustion chamber 23
Have two weirs (partition plates having an arbitrary height) 25a, 2
5b, the air 7a is sent from the bottom side of the two compartments on the left side of the figure divided by the two weirs 25a, 25b through the perforated plate 24 having a smaller hole diameter than the outer shape of the solid material. When oxygen is supplied from below, the mixture of sand and salt containing oil flows in the combustion chamber 23 so as to spring up. The treatment object 6 maintains a high temperature enough for the oil to burn,
Since the object 6 flows in the combustion chamber 23, the oil 7a filled in the combustion chamber 23 sufficiently spreads over the oil on the object 6 and flows while the oxygen in the air 7a flows as an oxidant. It burns naturally on the entire surface of the processed material 6. After the oil is completely burned, it is passed through the last weir 25b. The exhaust gas after combustion is discharged outside through a combustion chamber exhaust port 26 provided in the combustion chamber 23.

Workpiece after removal of oil (figure 6)
Is taken out from a combustion chamber outlet 27 on the bottom side of the section on the right side of the figure divided by a weir 25b provided in the combustion chamber 23. It should be noted that fuel such as kerosene 8a is mixed with the air 7a supplied to the combustion chamber 23 by a combustion mixer 36 as necessary to promote the combustion of the oil adhering to the object to be treated (solid matter 6). May be.

As a result of the hot gas 4 being blown out of the processing tank 1, the atmosphere from the processing tank 1 to the solid-gas separator 17 is in a non-oxidizing atmosphere, so that the rotary valve 43 is connected to the solid-gas separator 17 and the combustion chamber. The air 7a supplied to the combustion chamber 23 is prevented from flowing back to the solid-gas separator 17 by being provided between the two.

An example in which sand and salt are separated from two kinds of solid matter of sand and salt after removing oil in the combustion chamber 23 of the oil removing means 18 will be described with reference to FIG.

First, a mixture of sand and salt is put into the stirrer 29. The washing water 1 for further dissolving the salt is placed in the stirrer 29.
Supply 0. Sand and salt dissolved in water
a and is separated into sand partially containing water and water containing dissolved salts. The water containing the dissolved salt is heated by the evaporator 34 to evaporate the water, and only the salt is precipitated and collected in the collection container 38. The heating at this time may use the thermal energy of the exhaust gas 5 from the jet burner 2.
On the other hand, the sand containing a part of water after centrifugation is
In 5, the hot air from the blower 33 is received to evaporate the water, and is collected in the collection container 38 as low moisture content sand. Note that 40
a is a drive motor in the centrifuge 32a.

FIG. 4 shows another example of the oil removing means 18.

In this example, instead of the combustion chamber 23 in FIG.
A stirrer 30 is used.

The mixture (solids) 6 of sand and salt containing oil, which is an object to be processed, is charged into a stirrer 30 provided downstream of the solid-gas separator 17 on the solid side. Further, for example, cleaning kerosene 15 is supplied to the stirrer 30 from the other side as a cleaning liquid. Motor 4
The mixture is stirred at 0b, and the oil is extracted from the oil-containing sand and salt into the washing kerosene 15 and separated from the solid. The washing kerosene 15 containing the oil separated and extracted from the solid matter is supplied to the centrifugal separator 32.
B may be discharged through the discharge pipe 28 and used as the fuel 8 of the jet burner 2 as needed. On the other hand, the solid matter composed of sand and salt from which the oil has been removed is taken out from the outlet 31 of the centrifuge 32b. In addition, 40c is a motor of the centrifugal separator 32b.

Table 1 shows the weight ratio of each component such as the supplied material, the recovered solid content, and the recovered liquid when the oily waste is treated by the apparatus shown in FIG.

[0033]

[Table 1]

From the results shown in Table 1, the oil content of 38% was initially contained in the solid matter 6 recovered by the solid-gas separator 17 and the filter 19 at about 4% to 8%. It can be seen that spontaneous combustion occurs only by contacting with oxygen, the concentration becomes 2% or less, and oil attached to sand and salt can be almost removed.

When no salt is contained in the material to be handled, the solid matter is removed from the oil removing means 18 by installing only the oil removing means 18 under the solid-gas separator without installing any equipment below the stirrer 29. Just collect them.

[0036]

According to the present invention, oil, moisture, solids, etc. can be separated without containing other contaminants and can be efficiently recovered for reuse. Further, sand containing no oil, salt containing no oil, and sand and salt can be efficiently separated and recovered and reused.

[Brief description of the drawings]

FIG. 1 is a diagram showing an entire system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a processing situation in a processing tank shown in FIG.

FIG. 3 is a partially cutaway view showing the oil removing means shown in FIG. 1;

FIG. 4 is a diagram showing an oil removing unit replacing the oil removing unit shown in FIG. 3;

FIG. 5 is a diagram showing a method for removing oil using a conventional jet burner.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Processing tank, 2 ... Jet burner, 3 ... Flame jet stream, 4 ... Hot gas, 5 ... Exhaust gas, 6 ... Solid matter, 7, 7a ...
Air, 8 ... Fuel, 8a ... Kerosene, 9 ... Cooling water, 10 ... Washing water, 11 ... Spout, 12 ... Outlet, 13 ... Handling, 14
... Receivable receiving tank, 15 ... Kerosene washing, 16 ... Screw conveyor, 17 ... Solid gas separator, 18 ... Oil removing means,
19 ... filter, 20 ... wet condenser, 22 ... separation tank, 23 ... combustion chamber, 24 ... perforated plate, 25a, 25b ... weir (partition plate), 26 ... fuel chamber exhaust port, 27 ... combustion chamber outlet, 28 ... Discharge pipe, 29-30: Stirrer, 31: Centrifuge outlet, 32a, 32b: Centrifuge, 33: Blower, 34: Evaporator, 35: Dryer, 36: Fuel mixer, 37a-37f ... Conduit, 38 ... Recovery container, 39a ...
Circulation pump, 39b pump, 40a-40c motor, 43 rotary valve.

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Fujinami 4-13-17 Nakagawa, Adachi-ku, Tokyo Inside Hitachi Techno Engineering Co., Ltd. (72) Susumu Horiuchi 3-1-1 Sachicho, Hitachi-shi, Ibaraki Hitachi, Ltd. Hitachi Plant (72) Inventor Toshio Nakahira 3-1-1, Sachimachi, Hitachi-shi, Ibaraki Pref.

Claims (8)

[Claims] 1. A process in which a hot gas spouted from a jet burner provided in a processing tank is sprayed on a target object in a non-oxidizing atmosphere to dry and pulverize the object. A method of collecting solids by solid-gas separation of solids produced by drying and pulverizing the exhaust gas containing the generated gas and the gas in which the hot gas has changed and the handling material is dried and pulverized. After the gas separation, the solid is guided under an oxidizing atmosphere while maintaining the thermal energy obtained from the hot gas ejected from the jet burner, and the oil attached to the solid is oxidized and vaporized. A method for recovering solid matter by a jet burner, wherein the solid matter is removed. 2. The method according to claim 1, wherein the solid is introduced into an oxidizing atmosphere to supply a fuel when the oil adhering to the solid is oxidized and vaporized, thereby promoting the oxidization and vaporization of the oil. Recovery method of solid matter by jet burner. 3. A process in which a hot gas ejected from a jet burner provided in a processing tank is sprayed on a target object in a non-oxidizing atmosphere to dry and pulverize the object. A method of collecting solids by solid-gas separation of solids produced by drying and pulverizing the exhaust gas containing the generated gas and the gas in which the hot gas has changed and the handling material is dried and pulverized. A method for recovering a solid by a jet burner, comprising contacting the solid with an organic solvent after gas separation, and washing and removing an oil attached to the solid with the organic solvent. 4. The solid material according to claim 1, wherein when a part of the solid is a salt, the solid is washed with water after removing an attached oil. A method for recovering solid matter by using a jet burner, which comprises removing salt from the water. 5. A treatment tank for spraying a hot gas ejected from a jet burner onto an object to be processed in a non-oxidizing atmosphere to dry and pulverize the object to be processed, and generating a dry and pulverized product from the object to be processed. Solid-gas recovery device using a jet burner having solid-gas separation means for solid-gas separation of exhaust gas in which the treated gas and the gas in which the hot gas has changed are mixed and solid matter formed by drying and pulverizing the handled material. In the subsequent stage of the solid-gas separation means, the solid that maintains the thermal energy obtained from the hot gas ejected from the jet burner is placed in an oxidizing atmosphere to oxidize the oil adhering to the solid. An apparatus for recovering solid matter by a jet burner, comprising an oil removing means for vaporizing and removing. 6. An oil removing means according to claim 5, wherein said oil removing means collects a solid which is divided by a partition plate having an arbitrary height and supplies oxygen from below to said solid and a solid which has passed over said partition. An apparatus for collecting solids by a jet burner, comprising a compartment. 7. A treatment tank for spraying hot gas ejected from a jet burner onto a target object in a non-oxidizing atmosphere to dry and pulverize the object, and generating a dry gas from the object by drying and pulverizing the object. Solid-gas recovery device using a jet burner having solid-gas separation means for solid-gas separation of exhaust gas in which the treated gas and the gas in which the hot gas has changed are mixed and solid matter formed by drying and pulverizing the handled material. A jet burner provided at the subsequent stage of the solid-gas separation means, with an oil removing means for bringing the solid into contact with an organic solvent to wash and remove oil adhering to the solid with the organic solvent; For collecting solids. 8. The method according to any one of claims 5 to 7, wherein when a part of the solid is a salt, the solid is washed with water at a stage subsequent to the oil removing means to remove the solid from the solid. An apparatus for recovering solids by a jet burner, comprising a salt removing means for removing salt.