JPH0892569A - Purification of regenerated oil for injecting into tuyere of blast furnace - Google Patents

Abstract

PURPOSE: To obtain a regenerated oil usable to be blown into the tuyere of a blast furnace with a slurry pump by recovering a waste mineral oil, fractionating into a heavy viscous oil and a light viscous oil by a primary distillator, fractionating the heavy viscous oil into a regenerated oil and water by a secondary distillator, adjusting the pH and the viscosity of the regenerated oil by the quality inspection of the regenerated oil and filtering the oil after separating and removing water by an oil-water separator. CONSTITUTION: A recovered waste mineral oil is fractionated into a heavy-viscous oil 9 and a light viscous oil 7 by a primary distillator 3 and the heavy viscous oil 9 is fractionated into a regenerated oil and water by a secondary distillator composed of a highviscosity oil distillator 14 and a low-viscosity oil distillator 15. The pH and the viscosity value of the regenerated oil are adjusted by a regenerated oil quality inspection 29 and a chemical liquid containing a coagulant is poured into the oil to effect the coagulation and precipitation of the sludge. Water is separated from the regenerated oil by an oil-water separator 24 and the obtained oil 25 is filtered with a filter 27 to obtain a regenerated oil product 40 which can be blown into the tuyere 44 of a blast furnace 43 by a slurry pump 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention collects mineral waste oil,
The present invention relates to a method for refining regenerated oil for tuyere injection of blast furnace, which provides regenerated oil as a fuel that can be injected into tuyere of blast furnace through a regenerated oil refining process using a distiller.

[0002]

2. Description of the Related Art Conventionally, in order to supply mineral waste oil as tuyere injection fuel for a blast furnace, tuyere injection is generally performed using a liquid fuel control supply device for refined oil such as heavy oil. Normally, a gear pump or cascade pump is used for the flowmeter, and an elliptical gear type flowmeter is used for the flowmeter, so if the viscosity of the oil to be supplied is too high, the pump efficiency will drop extremely and the supply will be impossible. However, the accuracy of the flow meter is poor, and the particle size of impurities is limited.
Exceeding the particle size corresponding to the 0 mesh opening may cause the pump and flowmeter to become clogged with the moving parts, making it inoperable. Heavy viscous oil exceeding the appropriate viscosity may be used as fuel for tuyere injection in a blast furnace by conventional liquid fuel control. It was difficult to supply by the supply device.

[0003]

In order to supply the waste mineral oil as the tuyere blowing fuel of the blast furnace by the conventional liquid fuel control supply device, an appropriate kinematic viscosity value of 30 cSt (hereinafter, the kinematic viscosity value is a value at 50 ° C.). Particle size of the contaminants is 30
It is the actual situation that a mesh with mesh opening equivalent is applied, and it is difficult to apply heavy viscous oil that exceeds the appropriate kinematic viscosity value.Therefore, blast furnace blowing technology for heavy viscous oil and blast furnace blades The challenge is to establish a method for refining reclaimed oil for mouth blowing.

To solve this problem, the present invention collects mineral waste oil, and in a primary distiller, a heavy viscous oil having a blast furnace tuyere blowing proper viscosity and a light viscous oil having a tuyere blowing proper viscosity or less. Further, the heavy oil is divided into high-viscosity oil and low-viscosity oil, and regenerated oil content and water content are respectively separated in the high-viscosity oil distiller and the low-viscosity oil distiller secondary distiller. The pH value and the viscosity value of the regenerated oil are adjusted, and the sludge is coagulated and precipitated by injecting a chemical solution containing a coagulant. The regenerated oil is separated and removed by an oil-water separator to separate the separated oil Aims to provide a regenerated oil refining method for blast furnace tuyere blowing to obtain a regenerated oil product that can be blown into a blast furnace tuyere by a slurry pump after filtering with a filter that obtains an appropriate particle size for tuyere blowing. .

[0005]

In order to achieve the above object, in the method of the present invention, the mineral waste oil is recovered, and water content, flash point, specific gravity, pH value and viscosity value measurement and component analysis are included. After receiving quality inspection, it was fractionated in the primary distiller into heavy viscous oil that exceeds the optimum viscosity of the blast furnace tuyere and light viscous oil that is less than the optimum viscosity of the tuyere injection. A high-viscosity oil and a low-viscosity oil are classified into two parts, a high-viscosity oil distiller and a low-viscosity oil distiller, and a secondary distiller of the low-viscosity oil distillate into a regenerated oil content and a water content, respectively, and a sample is taken from the regenerated oil content.
After the water quality, the flash point, the specific gravity, the measurement of the pH value and the viscosity value, and the recycled oil quality inspection including the component analysis, when the pH value is 6.0 or less, the amine (ammonia-based) pH adjusting agent is added to the pH value. Adjusted to 6.0 to 8.0, and when the viscosity value exceeds the tuyere proper kinematic viscosity value of 30 cSt, the above light viscous oil is added to adjust to the proper kinematic viscosity value, and a chemical solution containing a coagulant is injected. The sludge is coagulated and settled, the regenerated oil is separated and removed by an oil-water separator, and the separated oil is filtered by a filter to obtain a proper tuyere blowing particle size equivalent to 30 mesh openings. Can be blown into the mouth.

When a flow meter is provided, a non-contact type flow meter such as an ultrasonic Doppler system or an electromagnetic flow meter is provided instead of a mechanical system such as an elliptical gear.

Further, the water separated by the secondary distiller and the oil / water separator is treated as waste water, and a chemical liquid containing a coagulant is injected by a chemical liquid injector to coagulate and settle sludge.

[0008]

By the means and method described above, the mineral waste oil is recovered, and the quality of water, flash point, specific gravity, pH value and viscosity value are measured, and the quality of the received material is analyzed. It is divided into heavy viscous oil having a kinematic viscosity value of 30 cSt or more and light viscous oil having a kinematic viscosity value of 30 cSt or less, and further classified into high viscosity oil and low viscosity oil of the heavy viscosity oil. In the secondary distillers of the high-viscosity oil distiller and the low-viscosity oil distiller, respectively, the regenerated oil content and the water content are separately fractionated, and samples are taken from the regenerated oil content to obtain the water content, the flash point, the specific gravity, the pH value and the viscosity value. As a result of the inspection in the regenerated oil quality inspection including the measurement and the component analysis, when the pH value is 6.0 or less, an amine (ammonia type) pH adjusting agent is added to adjust the pH value to 6.0 to 8.0. , Viscosity value is 30c
When it exceeds St, the above-mentioned light viscous oil is added to adjust the kinematic viscosity to an appropriate value, and a chemical solution containing a coagulant is injected by a chemical solution injector to coagulate and settle sludge. The separated oil is separated and removed, and the separated oil is filtered by a filter to obtain an appropriate particle size of tuyere blowing corresponding to the opening of 30 meshes even if foreign matters are present, and then blown into the tuyere of the blast furnace by a slurry pump.

When a non-contact type flow meter such as an ultrasonic Doppler system or an electromagnetic flow meter is installed as the flow meter, the flow rate and the measurement accuracy are high, even if the oil is heavy viscous oil or contains impurities. Is measured without affecting the.

Further, the water separated by the secondary distiller and the oil / water separator is treated as waste water, and the chemical liquid containing the coagulant is injected by the chemical liquid injector, and the sludge is coagulated and sedimented to complete the waste oil treatment. .

[0011]

EXAMPLES Examples will be described with reference to the drawings.
In FIG. 1, the waste mineral oil 1 is collected, and the water content, the flash point,
After the acceptance quality inspection 2 including the measurement of the specific gravity, pH value and viscosity value and the component analysis, the heavy distillate oil (canned liquid) 9 in the primary distiller 3 which exceeds the proper viscosity of the tuyere 44 of the blast furnace 43 is blown. , The tuyere 44 is sprayed into a light viscous oil (distillate) 7 having an appropriate viscosity or less, and the heavy viscous oil 9 is divided into a high viscosity oil line 12 and a low viscosity oil line 13, In a secondary distiller consisting of a viscous oil distiller 14 and a low viscosity oil distiller 15, a high viscosity reclaimed oil 18, a low viscosity reclaimed oil 19 and a water content 2 respectively.
0 and 20 are fractionated, high-viscosity reclaimed oil 18 and low-viscosity reclaimed oil 19 are received in a reclaimed oil tank 21, a sample 22 is collected from the reclaimed oil, and the water content, the flash point, the specific gravity, and the pH value measured by a pH measuring device 32. According to the results of the regenerated oil quality inspection 29 including the measurement of the viscosity value by the viscosity meter 30 and the component analysis, the pH value was 6.0.
In the following cases, an amine (ammonia-based) pH adjuster 33 is added to adjust the pH value to 6.0 to 8.0, and the viscosity value 3
When 0 exceeds the proper kinematic viscosity value of 30 cSt blown into the tuyere 44, the light viscous oil 7 is added from the oil line 11 to adjust the kinematic viscosity value to 30 cSt, and the chemical liquid injector 34 is used to adjust the chemical liquid containing the coagulant. 35 to inject sludge for coagulation and sedimentation,
The reclaimed oil 23 containing water in the reclaimed oil tank 21 is transferred to the oil / water separator 2
4, the oil content 25 and the water content 26 are separated, and the separated oil content 25 is filtered by a filter 27 which obtains an appropriate particle size of tuyere blowing corresponding to the opening of 30 mesh, and is blown to the tuyere 44 of the blast furnace 43 by the slurry pump 41. Recycled oil products that can be included 4
A refining oil refining method for blast furnace tuyere injection is provided which is characterized by obtaining 0.

[0012]

Since the present invention is configured as described above, it has the following effects.

Since the waste material of mineral matter is systematically recovered as a reusable raw material for the tuyere injection of blast furnace fuel, it is not necessary to treat waste oil as industrial waste.

In addition to the heavy viscous oil, a light viscous oil is obtained in the primary distiller, and the heavy viscous oil can be treated by the method of the present invention and blown into the tuyere of the blast furnace, The quality oil can be blown into the tuyere of the blast furnace by the existing liquid fuel control and supply device according to the prior art, and the measured kinematic viscosity of the regenerated oil is 3
When it exceeds 0 cSt, it can be added to the regenerated oil to reduce the viscosity.

Further, since the secondary distiller processes the oils of different kinds of viscosity into the high-viscosity oil distiller and the low-viscosity oil distiller separately, the distilling temperature and the control target are respectively set according to the oil type. If a value is set, the process can be controlled easily and work can be performed efficiently.

Further, a sample is taken from the regenerated oil, and water,
According to the results of regenerated oil quality inspection including measurement of flash point, specific gravity, pH value and viscosity value, and component analysis, when the pH value is 6.0 or less, an amine (ammonia-based) pH adjusting agent is added to adjust the pH value to 6 When adjusted to 0.0 to 8.0, and the measured viscosity value exceeds the tuyere blowing proper kinematic viscosity value of 30 cSt, the above light viscous oil is added to regulate the kinematic viscosity value of 30 cSt to prepare a chemical solution containing a coagulant. Since it is injected and sludge is coagulated and settled,
The desired stable regenerated oil quality is obtained.

Further, the regenerated oil containing water is separated and removed by an oil-water separator, the regenerated oil is filtered by a filter, and the tuyere can be blown to the tuyere of the blast furnace by a slurry pump as a proper particle size. it can.

The regenerated oil obtained by the method of the present invention is not only used as a fuel for the blast furnace alone as described above, but is also rich in industrial waste such as mill scale, oil impregnated scale, and ground iron powder. As a granular iron raw material, it can be mixed with regenerated oil to form a slurry, and can be used as a raw material medium for blowing and feeding from tuyere of a blast furnace.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the present invention.

[Explanation of symbols]

 1 Mineral waste oil 2 Acceptance quality inspection 3 Primary distiller 7 Light viscous oil (distillate) 8 Still 9 Heavy viscous oil (canned liquid) 11 Light viscous oil line 12 High viscosity oil line 13 Low viscosity oil Line 14 High-viscosity oil distiller 15 Low-viscosity oil distiller 18 High-viscosity oil 19 Low-viscosity oil 20 Water 21 Reclaimed oil tank 22 Reclaimed oil sample 23 Reclaimed oil containing water 24 Oil-water separator 25 Oil content 26 Moisture 27 Filter 29 Reclaimed oil Quality inspection 30 Viscosity meter 32 pH meter 33 pH adjuster 34 Chemical solution injector 35 Chemical solution 36 Control valve 40 Recycled oil product 41 Slurry pump 42 Non-contact type flow meter 43 Blast furnace 44 Tuyer

Claims (1)

[Claims] 1. The waste mineral oil is recovered and subjected to an acceptance quality inspection including measurement of water content, flash point, specific gravity, pH value and viscosity value, and component analysis, and then subjected to a blast furnace tuyere proper viscosity in a primary distiller. Over viscous oil and light viscous oil with proper viscosity less than the tuyere blowing, fractionated and further divided into high viscosity oil and low viscosity oil among heavy viscous oils and high viscosity oil distillers, respectively. In the low-viscosity oil distiller and the secondary distiller, the regenerated oil content and the water content are respectively fractionated, and samples are taken from the regenerated oil content, the water content, the flash point,
By regenerated oil quality inspection including measurement of specific gravity, pH value and viscosity value, and component analysis, the pH value is adjusted to the proper tuyere blowing pH value by adding a pH adjusting agent as necessary, and the viscosity value is the tuyere. When it exceeds the appropriate blowing viscosity, the above-mentioned light viscous oil is added to adjust it to the appropriate value for the tuyere blowing, and a chemical solution containing a flocculant is injected to coagulate and settle the sludge. The separated oil component is separated and filtered, and the separated oil is filtered by a filter to obtain the proper particle size for tuyere blowing, and a reclaimed oil product that can be blown into the tuyere of the blast furnace by a slurry pump is obtained. Oil refining method