JPH116019A - Oil-impregnated sludge treatment method and apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently burn and remove oil content without developing any trouble in an equipment and an operation in a sintering process and to effectively and practically use waste energy, at the time of recycling sludge containing the oil content, moisture and iron content as an iron source. SOLUTION: The one end of a drying duct 4 is connected with the exhaust gas side of a pulse combustion device 3, and the other end is opened near the upper surface of sintering raw material 10 in a sintering machine 6, e.g. at the upstream side from a burner part 8 of an ignition furnace 7 or near the flame part 9. A sludge supplying device 2 for supplying the sludge into the drying duct 4, is provided. The sludge 1 containing the oil content and the moisture is dry-treated with a pulse combustion method and dried oil-containing sludge is injected into the burner part 8 and supplied onto the upper surface of the sintering raw material 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating oil-containing sludge used for recycling an oily water-containing sludge generated in a continuous casting step, a rolling step, or the like as an iron source.

[0002]

2. Description of the Related Art In steelmaking, sludge generated in a continuous casting process, a rolling process, or the like contains a large amount of iron in a state of iron oxide, but it is extremely significant if this can be recycled as a raw material for ironmaking. However, this sludge usually contains about 40 to 70% of water and 1 to 1%.
When used as a raw material for a sintering machine, the oil content of about 0% is mixed, and the contained oil cannot be sufficiently burned in the sintering machine to generate oil vapor, which is generated in an electric dust collector of an exhaust gas treatment system. There is a problem that burning or explosion may cause burning accidents.

[0003] Further, even if the oil is removed by combustion, the combustible component (oil) is in poor contact with the oxygen because the combustible component is dilute and muddy, and the combustibility is very poor.

To solve such a problem, Japanese Patent Laid-Open Publication No. 55-2
No. 8484 discloses that the sludge is heated in advance by a rotary kiln or the like, and is incinerated to remove oil and water.
A method of using the remaining incinerated ash as a raw material for sintering is disclosed, and Japanese Patent Application Laid-Open No. 55-79835 discloses a process for removing water from sludge and burning off oil, which comprises a sintering machine. The flue gas with a large amount of sensible heat generated by the combustion of the sludge is effectively used in the steelmaking raw material processing process, and the iron in the sludge is separated and recovered as dust from the flue gas by a dust collector. A method of using the dust as a sintering material again is disclosed.

[0005]

Both methods require a step of removing oil and water in the sludge and a step of returning an iron-containing solid called incinerated ash or dust from which oil and water have been removed to a sintering raw material. Become. In particular, in the step of returning the iron-containing solid to the sintering raw material, it is necessary to cool the solid to a temperature at which the solid can be transported by a conveyor or the like due to its handling.
It is disadvantageous in terms of effective use of energy.

Further, Japanese Patent Publication No. Hei 8-507601 discloses that a slurry of oily and water-containing sludge is sprayed from a nozzle onto an upper layer of a sintered layer at a position downstream of a burner of an ignition furnace of a sintering machine. It is disclosed that the above-mentioned sludge is completely combusted.However, moisture penetrates into the sintering layer to increase the viscosity, and inhibits ventilation of air for burning the sintering raw material, thereby improving good flammability. I can't secure it.

The present invention has been made in view of the above-mentioned problems of the prior art,
When sludge containing oil moisture and iron is processed in a sintering machine and recycled, the oil is efficiently burned off without hindering the flammability in the sintering machine, and the waste energy is effectively used. Is also possible.

[0008]

Means for Solving the Problems The present invention is as follows.

[0009] A method for treating oil-containing sludge, comprising drying sludge containing oil and water by a pulse combustion method, and supplying the dried oil-containing sludge to the upper surface of a sintering raw material of a sintering machine.

[0010] The method for treating oil-containing sludge as described above, wherein the dried oil-containing sludge is supplied to an upper surface of a sintering raw material upstream of a burner portion of an ignition furnace of a sintering machine.

The method for treating oil-containing sludge as described above, wherein the dried oil-containing sludge is blown into a burner portion of an ignition furnace of a sintering machine and supplied to an upper surface of a raw material for sintering.

A pulse combustor, a drying duct having one end connected to the exhaust side of the pulse combustor, and the other end opened near the upper surface of the sintering material of the sintering machine, and sludge supplied to the drying duct. An oil-containing sludge processing apparatus provided with a sludge feeder.

A pulse combustor, and a drying duct having one end connected to the exhaust side of the pulse combustor and the other end open near the upper surface of the sintering raw material upstream of the burner portion of the ignition furnace of the sintering machine. And a sludge supply device for supplying sludge to the drying duct.

[0014] A pulse combustor, a drying duct having one end connected to the exhaust side of the pulse combustor, and the other end opened near the frame portion of the burner portion of the ignition furnace of the sintering machine; An oil-containing sludge processing apparatus comprising a sludge supply device for supplying sludge.

A pulse combustor, a drying duct having one end connected to the exhaust side of the pulse combustor, and the other end connected to a fuel pipe or an air pipe of a burner portion of an ignition furnace of the sintering machine; An oil-containing sludge processing device comprising a sludge supply device for supplying sludge to a duct.

As shown in FIG. 4, the pulse combustor generally includes a combustion chamber 18, a tail pipe 17 connected to the exhaust side of the combustion chamber 18, a combustion air supply port 21, and a fuel supply port 20.
And a spark plug 19. A mixed gas of air and fuel is periodically sent to the combustion chamber 18, and the sent gas of air and fuel causes a combustion explosion due to the high temperature atmosphere of the combustion chamber 18, and the high-temperature impact pulsating combustion gas stream 5 is generated. Occur. It should be noted that the ignition by the spark plug 19 is performed at the start of the operation, and when the temperature inside the combustion chamber 18 becomes high due to several combustion explosions, the combustion explosion occurs only by blowing the mixed gas as described above. The high-temperature shock pulsating combustion gas flow 5 generated by the explosion flows through the tail pipe 17 at high speed, and is jetted to the drying duct 4 connected to the exhaust side of the tail pipe 17. Hot shock pulsating combustion gas flow 5 flowing in tail pipe 17
Has a large inertia, and when the discharge to the drying duct 4 is completed, the inside of the combustion chamber 18 changes from a high pressure to a negative pressure, and the mixed gas of fuel and air is sucked again, and the next combustion explosion occurs. In this way, the repetition of the explosion, the exhaust, and the intake continuously produces the high-temperature shock pulsating combustion gas flow 5 in the tail pipe 17. The frequency of the generated high-temperature shock pulsating combustion gas flow 5 is determined by the volume of the combustion chamber 18, the volume and length of the tail pipe 17, the fuel, and the like.

In the present invention, sludge is finely crushed by a high-temperature shock pulsating combustion gas flow generated by pulse combustion,
At the same time, it promotes the evaporation of water from the sludge, instantaneously bringing it into a state of extremely fine and dry fine powder. Since the sludge in this state is supplied to the upper surface of the sintering raw material of the sintering machine, there is no problem of obstructing the ventilation of air for burning the sintering raw material,
Since good flammability can be ensured and the dried oil-containing sludge is in a fine powder state, it burns well, and the combustion heat of oil can be effectively used for heating the sintering raw material. When the dried oil-containing sludge is supplied to the upper surface of the sintering raw material upstream of the burner of the ignition furnace of the sintering machine, it is directly heated by the burner of the ignition furnace, and the flammability of the oil-containing sludge is increased. Is very good. Furthermore, when the dried oil-impregnated sludge is blown into the burner section of the ignition furnace of the sintering machine, the oil-impregnated sludge is exposed to the extremely high-temperature frame section of the burner section for a long time, so that the combustibility is further improved. .

Since the combustion gas of the pulse combustion is supplied to the upper surface of the sintering raw material through the drying duct, the sensible heat of the combustion gas can be effectively used for heating the sintering raw material in the sintering machine.

Further, in the pulse combustion, the drying is performed instantaneously, and the object to be dried is transported by a high-temperature shock pulsating combustion gas stream. Therefore, it can be easily guided to an arbitrary place only by providing a pipe.

[0020]

FIG. 1 shows an embodiment of the apparatus of the present invention, that is, a pulse combustor 3 having one end connected to the exhaust side of the pulse combustor 3 and the other end of a sintering machine 6. Ignition furnace 7
1 shows an oil-containing sludge processing apparatus provided with a drying duct 4 opened in the vicinity of a frame section 9 of a burner section 8 and a sludge supply device 2 for supplying sludge to the drying duct 4. The drying duct 4 is connected to the exhaust side of the tail pipe of the pulse combustor 3 as shown in FIG.

The drying duct 4 has one end opened in the vicinity of the frame 9 through the side wall of the ignition furnace 7, and can supply oil-containing sludge dried by pulse combustion into the frame 9. The sintering machine 6 heats the granular iron ore to a high temperature,
This is a facility for producing sinter ore which is agglomerated and used as a raw material for a blast furnace. A sintering raw material is supplied from a sintering raw material feeder (not shown) onto a moving grate base 22 to form a sintered layer 10. The ignition furnace 7 is installed above the sintering layer 10, and the lower part of the sintering layer 10 is guided to an exhaust gas treatment system 12 via a wind box 11, and is subjected to dust collection processing and the like.

The oily water-containing sludge 1 supplied to the drying duct 4 by the sludge supply device 2 is crushed and dried by the high-temperature shock pulsating combustion gas stream 5 generated by the pulse combustor 3. The pulsating exhaust stream 5 ′ containing the dried oil-containing sludge and the combustion gas is blown into the frame section 9 of the burner section 8 of the ignition furnace 7 of the sintering machine 6 from one opening of the drying duct 4, and a part of the oil-containing sludge is The combustion is completed in the frame portion 9, and the remainder ends in the upper layer of the sintered layer 10 immediately below the frame portion 9. The combustion gas in the pulse combustor 3 and the combustion gas of the oil in the sludge are guided to the lower sintered layer 10 through the burner section 8, are sucked from the wind box 11, and are burned in the same manner as the combustion exhaust gas of the burner section 8. Tie 10
Heat.

FIG. 2 shows another embodiment of the apparatus of the present invention, in which one end of a drying duct 4 is opened upstream of an ignition furnace 7. In this apparatus, a pulsating exhaust stream 5 ′ containing oil-containing sludge dried by pulse combustion is jetted to the upper layer of the sintered layer 10 on the upstream side of the ignition furnace 7 to supply oil-containing sludge on the layer. I do.

FIG. 3 shows still another embodiment of the apparatus of the present invention.
Is connected to one end of a drying duct 4 to supply a pulsating exhaust stream 5 ′ containing oil-containing sludge dried by pulse combustion into the frame portion 9.

[0025]

EXAMPLE Using the apparatus shown in FIG. 1, a sludge 1 containing 60% moisture and 5% oil and containing 65% iron in a dried solid is used as an oil moisture sludge 1 and is generated at an ironworks. The sludge feeder 2 was supplied to the drying duct 4 connected to the pulse combustor 3 using the coke oven gas 13 as a fuel using a screw feeder. The frequency of intermittent combustion performed to generate pulsation in the pulse combustor 3 is 100H
At z, the combustion air 15 was supplied such that the air ratio became 1.2. The pulsating exhaust stream 5 ′ containing the oil-containing sludge dried by the pulse pulsating combustion gas stream 5 of the pulse combustion was supplied to the frame section 9 of the burner section 8 of the ignition furnace 7 of the sintering machine 6. In the ignition furnace 7, coke oven gas was supplied as fuel from the fuel pipe section 14, and combustion air was supplied from the air pipe section 16 so as to have an air ratio of 1.1.

In this example, the oil in the sludge burned well, the amount of oil detected in the dust collection system was very small, there was no trouble such as burning, and the sintering operation could be performed smoothly. The sintering quality was not particularly different from the conventional one.

Also, when the dried oil-containing sludge is supplied to the sintering machine 6 upstream of the ignition furnace 7 using the apparatus shown in FIG. The oil burned well, and the amount of oil detected in the dust collection system was very small. There was no trouble such as burning, and the sintering operation was performed smoothly and the sintering quality was good.

Furthermore, when the apparatus shown in FIG. 3 was used under the same operating conditions as described above, both the operation and the quality were good.

[0029]

According to the present invention, sludge containing oil and water can be effectively used as a raw material for iron making, the energy used for treating oil-containing sludge can be efficiently used, and energy saving is very effective. In addition, since the processing steps are simple, equipment costs and maintenance costs are extremely low, and the cost is very good.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of an apparatus for treating oil-containing sludge of the present invention.

FIG. 2 is a view showing another embodiment of the apparatus for treating oil-containing sludge of the present invention.

FIG. 3 is a diagram showing an example of connection of a drying duct to a burner part in the oil-containing sludge treatment apparatus of the present invention.

FIG. 4 is a diagram showing an example of a pulse combustor in the apparatus for treating oil-containing sludge of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sludge containing oil and water 2 Sludge feeder 3 Pulse burner 4 Dry duct 5 Impact pulsating combustion gas flow 5 'Pulsating exhaust flow 6 Sintering machine 7 Ignition furnace 8 Burner 9 Frame 10 Sintering layer 11 Windbox 12 Exhaust gas treatment System 13 Coke oven gas 14 Fuel pipe section 15 Combustion air 16 Air pipe section 17 Tail pipe 18 Combustion chamber 19 Spark plug 20 Fuel supply port 21 Combustion air supply port 22 Moving grate table

Claims (7)

[Claims] 1. A method for treating oil-containing sludge, comprising drying sludge containing oil and moisture by a pulse combustion method, and supplying the dried oil-containing sludge to the upper surface of a sintering raw material of a sintering machine. 2. The method for treating oil-impregnated sludge according to claim 1, wherein the dried oil-impregnated sludge is supplied to an upper surface of a sintering raw material at an upstream side of a burner portion of an ignition furnace of a sintering machine. 3. The method for treating oil-impregnated sludge according to claim 1, wherein the dried oil-impregnated sludge is blown into a burner of an ignition furnace of a sintering machine and supplied to an upper surface of a sintering raw material. 4. A pulse combustor, a drying duct having one end connected to the exhaust side of the pulse combustor and the other end opened near the upper surface of the sintering raw material of the sintering machine, and a sludge formed in the drying duct. And a sludge feeder for supplying oil. 5. A pulse combustor, one end of which is connected to the exhaust side of the pulse combustor, and the other end of which is open near the upper surface of the sintering raw material upstream of the burner portion of the ignition furnace of the sintering machine. An oil-containing sludge processing apparatus comprising a drying duct and a sludge supply device for supplying sludge to the drying duct. 6. A pulse combustor, a drying duct having one end connected to the exhaust side of the pulse combustor, and the other end open to the vicinity of a frame portion of a burner portion of an ignition furnace of the sintering machine. An oil-containing sludge processing device comprising a sludge supply device for supplying sludge to a duct. 7. A pulse combustor, and a drying duct having one end connected to the exhaust side of the pulse combustor and the other end connected to a fuel pipe or an air pipe of a burner portion of an ignition furnace of the sintering machine. An oil-containing sludge processing apparatus comprising a sludge supply device for supplying sludge to the drying duct.