CN110871192A - Method for reducing heavy oil coating and oil stain on surface of steel coil in longitudinal shearing processing - Google Patents
Method for reducing heavy oil coating and oil stain on surface of steel coil in longitudinal shearing processing Download PDFInfo
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- CN110871192A CN110871192A CN201911041707.6A CN201911041707A CN110871192A CN 110871192 A CN110871192 A CN 110871192A CN 201911041707 A CN201911041707 A CN 201911041707A CN 110871192 A CN110871192 A CN 110871192A
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Images
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B08B1/143—
-
- B08B1/30—
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B13/00—Accessories or details of general applicability for machines or apparatus for cleaning
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/045—Cleaning involving contact with liquid using perforated containers, e.g. baskets, or racks immersed and agitated in a liquid bath
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/12—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration by sonic or ultrasonic vibrations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/10—Cleaning involving contact with liquid with additional treatment of the liquid or of the object being cleaned, e.g. by heat, by electricity or by vibration
- B08B3/14—Removing waste, e.g. labels, from cleaning liquid; Regenerating cleaning liquids
Abstract
The invention belongs to the technical field of steel coil and steel plate process processing, and discloses a method for reducing heavy oil coating and oil stain on the surface of a steel coil in longitudinal shearing processing. And wiping the surface by using a clean rag at the position of the winding machine, and removing the oil stain on the surface. The invention reduces 70% black or gray oil stain on the surface of the steel plate; the smoothness of the surface of the steel plate is improved; the subsequent electroplating and welding processes of the steel plate are not influenced; the cost is low, 15-30 yuan/L of hydrocarbon cleaning agent is used for cleaning a 10T roll by about 5L, and the average 1T cost is 7.5-15 yuan. The hydrocarbon cleaning agent of the invention selects a suitable type of hydrocarbon cleaning agent after tests aiming at different materials, cleaning requirements, dirt and the like of cleaning objects.
Description
Technical Field
The invention belongs to the technical field of steel coil and steel plate process processing, and particularly relates to a method for reducing heavy oil coating and oil stain on the surface of a steel coil in longitudinal shearing processing.
Background
Currently, the closest prior art:
the surface of the steel coil is generally oiled as follows: oil-free, light coating, medium coating and heavy coating. When hot galvanizing materials are processed, the surface of a steel plate is extruded and rubbed by a pinch roll, a pressing plate and a tension plate wool felt to cause the zinc powder on a zinc layer to fall off, and the zinc powder and the surface of a steel coil are oiled and combined to form black or gray oil stains. Similar oil stain problems can be generated in cold rolled materials due to process problems when steel is rolled in some small and medium-sized steel mills. The heavy oil and oil stain problem can affect the surface quality of the steel coil and subsequent electroplating, welding and other processes.
At present, an oil film cleaning machine is used for removing oil of mainstream equipment, but the oil film cleaning machine is dozens of millions at a high price, and the oil film cleaning machine is a small economic burden for small and medium-sized enterprises or enterprises with few orders.
The excellent cleaning agent CFC-113 (Freon) and 1, 1-trichloroethane (ethane) which are widely used in the cleaning industry have been completely prohibited from being produced and used. There are chlorine-based cleaners (trichloroethane, trichloroethylene, methylene chloride, etc.), water-based cleaners, hydrocarbon-based cleaners, etc. which are still in use at present, and it is presumed that these users have been using chlorine-containing cleaners for some time because of the advantage that chlorine-containing cleaners can be used by modifying the existing equipment slightly.
However, since the chlorine-containing cleaning agent is toxic, the environmental control is severe, and since there is a limit requirement for the chlorine-containing cleaning agent, the enterprises are now beginning to change to hydrocarbon-based cleaning agents and water-based cleaning agents. The water-based cleaning agent has high equipment investment cost and is not easy to dry, the cleaned steel coil often generates rust and spots, the problem of drainage needs to be considered, and various manufacturers gradually begin to research substitutes of the water-based cleaning agent.
In summary, the problems of the prior art are as follows:
at present, oil film cleaning machines are used for removing oil in equipment, so that the production cost is high, and the oil film cleaning machines are a great economic burden for enterprises. In the prior art, the cleaning effect is poor, the cost is high and the environment is not protected due to the fact that a cleaning agent is not suitable to be used in cleaning.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for reducing heavy oil coating and oil stain on the surface of a steel coil in longitudinal shearing processing.
The invention is realized in such a way that the method for reducing the oil recoating and the oil stain on the surface of the steel coil by the longitudinal shearing processing comprises the following steps:
firstly, feeding materials in a longitudinal shearing process, and spraying a hydrocarbon cleaning agent on the surface of a material at an uncoiler by using a sprayer;
and secondly, arranging personnel at the position of the winding machine to use a clean rag to wipe the surface, and removing the oil stain on the surface.
Further, in the first step of using the atomizer to spray hydrocarbon cleaner on the material surface at decoiler department, treat that the coil of strip that washs through heavily fat liquoring and greasy dirt cleaning equipment, heavily fat liquoring and greasy dirt cleaning equipment carry out the cleaning method and include:
1) preliminary washing, ultrasonic immersion washing and throwing, rotating, washing with charring water for 3-30min at normal temperature of-100 deg.C, filtering in a cylinder, and cooling;
2) fine washing, ultrasonic immersion washing, polishing and rotating, washing with charring water for 3-30min at normal temperature of-100 deg.C, filtering in a cylinder, and cooling;
3) rinsing, ultrasonic immersion cleaning, rotating, cleaning with charring water for 3-30min at normal temperature-100 deg.C, filtering in a cylinder, and cooling;
4) cutting liquid, vacuum drying, high-speed air knife, rotary vacuum drying, high-speed hot air for 3-30min, filtering at RT-150 deg.C, and exhausting.
5) Recovering, vacuum distilling and recovering or multi-stage distilling and recovering.
Furthermore, heat conducting oil is adopted for heating, and forced cooling equipment is adopted for cooling.
Further, the hydrocarbon cleaning agent in the first step includes a dehydration type hydrocarbon cleaning agent and an antirust type hydrocarbon cleaning agent.
Furthermore, the hydrocarbon cleaning agent in the first step further comprises a fluxing agent removing type hydrocarbon cleaning agent and a carbon ash removing type hydrocarbon cleaning agent.
Further, in the first step, the hydrocarbon cleaning agent further comprises a wax removal type hydrocarbon cleaning agent and a resin removal type hydrocarbon cleaning agent.
Further, in the second step, the wiping method of the rag comprises the following steps: sequentially wiping from left to right and from top to bottom; the frequency of replacing the cleaning cloth is as follows: and replacing the cleaning cloth with 10 steel coils each time.
Another object of the present invention is to provide a heavy oil and oil cleaning apparatus comprising:
the tank body is formed by welding stainless steel plates with the thickness of 8mm, is provided with a visual window, and is externally connected with a cooling box and a waste oil collecting box, and a waste oil and waste residue discharge pipe is arranged at the bottom of the controllable operation vacuum tank;
the lower part of the tank body is externally added with a hot oil bag, a heat conduction oil heating box is externally arranged, firstly, a heating pipe heats heat conduction oil, then, the heating oil is conveyed to the heating oil bag through a pump, and then, the heating oil is conveyed back to the heating box for heating after heat exchange, and the process is circulated; the heating oil bag is provided with an independent temperature control system, and the oil temperature is regulated at R.T. -140 ℃;
the recovered cleaning agent is pumped into a vacuum distillation recovery tank through a pump, and before entering the vacuum recovery tank, the cleaning agent firstly enters a heat exchange cylinder to exchange heat with an HC steam pipe recovered by distillation; after vacuumizing, the cleaning agent is quickly boiled and evaporated to generate HC steam, and then the HC steam is condensed and recovered in a condensation area, and the recovered pure cleaning agent is discharged into a liquid storage tank for recycling;
a powerful vacuum decompression system, which is provided with a vacuum decompression pump and a vacuum display meter; is provided with a vacuum motor and an electromagnetic valve; the high-temperature carbonized water rapidly forms HC steam under the condition of reduced pressure, is pumped out of the recovery tank by a vacuum pump, forms liquid in the cooling tank again, is filtered by activated carbon to form regenerated liquid, and is recycled;
the cooling system is provided with a water cooler, continuously provides cooling water for the vacuum recovery machine, and supplies a part of the cooling water to the two liquid storage tanks to prevent the cleaning agent from being heated;
the waste liquid treatment system is used for carrying out heat exchange on high-temperature residue and waste oil left after vacuum distillation and recovery after a valve is opened, the waste liquid enters a cooling box, the cooling box is communicated with a cold water coil pipe for carrying out heat exchange, and the high-temperature waste oil is collected in a waste oil tank for centralized treatment after being cooled;
the condensing system is provided with a cooling box for vacuum recovery and cools the high-temperature HC steam to form liquid; a cooling box is needed in a waste oil treatment system, high-temperature waste oil is cooled and treated in a centralized manner, and a set of refrigerating unit is arranged to provide a cold source for equipment;
the liquid supplementing system is used for ensuring that the cleaning liquid in the distillation recovery tank meets the working requirements of the day, if the liquid level is too low, the float type liquid level control triggers the micro switch to send a signal and cut off a heating power supply of the tank, and the buzzer sends out an alarm to prompt that the cleaning liquid is insufficient and liquid needs to be added from the outside;
during regeneration, the liquid of distillation accumulator will be distilled basically futilely, and the washing liquid after the regeneration is whole to be stored in the reservoir, and the washing liquid is not enough in the reservoir, inserts the pipe of taking special interface in the stock solution bucket, screws up the interface, opens the compressed air switch, and compressed air is impressed from stock solution bucket air inlet, extrudes the reservoir from the liquid outlet with the cleaner in, and when filling up the reservoir liquid level and reaching the high level, bee calling organ sent the warning, closes compressed air, finishes the fluid infusion.
Further, the cleaning method of the heavy oil coating and oil stain cleaning equipment further comprises the following steps:
firstly, putting a steel coil to be cleaned into a washing basket, then putting the washing basket into an equipment feeding area, and lifting the washing basket to a cleaning main tank by controlling a mechanical arm by an operator; the cylinder drives the tank cover to automatically close the cleaning tank, the vacuum degassing system is started, and air in the tank is completely pumped out; pumping out gas in narrow gaps of a steel coil to be cleaned and gas contained in a cleaning agent in a vacuum state, starting ultrasonic waves, starting a swinging device, and driving a washing basket to rotate so that the cleaning agent can be fully cleaned; after the set time, the vacuum is released, the cover is opened by the driving of the air cylinder, and the basket is lifted out by the mechanical arm and enters the second groove for cleaning.
Further, operating pressure of heavy oil coating and oil stain cleaning equipment is 50-100 Torr, and temperature is 90-120 ℃;
the waste liquid treatment system is also provided with a plurality of moistening tanks.
In summary, the advantages and positive effects of the invention are:
the longitudinal shearing process of the invention slowly feeds materials, and a sprayer is used at the uncoiler to spray hydrocarbon cleaning agent on the surface of the material, and the hydrocarbon cleaning agent has the effects of removing oil, dissolving oil stain and preventing rust. Arranging personnel at the position of the winding machine to use a clean rag to wipe the surface and remove oil stains on the surface. The invention reduces 70% black or gray 'oil stain' on the surface of the steel plate; the smoothness of the surface of the steel plate is improved; the subsequent electroplating and welding processes of the steel plate are not influenced; the cost is low, 15-30 yuan/L of hydrocarbon cleaning agent is used for cleaning a 10T roll by about 5L, and the average 1T cost is 7.5-15 yuan.
The density of the hydrocarbon cleaning agent is 0.7-0.8, and the density of pure hydrocarbon is 0.72-0.74.
The hydrocarbon cleaning agent has complete SGS environment-friendly detection reports, and passes the detection of a disease prevention and control center. The hydrocarbon cleaning agent provided by the invention can be used for detecting the quality in real time through an independent laboratory, and the cleaning capacity of the hydrocarbon cleaning agent can be continuously improved.
The hydrocarbon cleaning agent of the invention selects a suitable type of hydrocarbon cleaning agent after tests aiming at different materials, cleaning requirements, dirt and the like of cleaning objects.
The hydrocarbon cleaning agent has different cleaning requirements for different metal parts, and different types of hydrocarbon cleaning agents are adopted, particularly for metal parts with blind holes. Two kinds of hydrocarbon cleaning agents with different cleaning forces are adopted.
The invention has a perfect technical service system, efficiently utilizes the hydrocarbon cleaning agent and combines specific cleaning equipment such as ultrasonic equipment and vacuum cleaning equipment. The cleaning requirement is met, and the cost is saved.
The hydrocarbon cleaning agent has mature client cases in use, some successful cases in the same industry are analyzed when the hydrocarbon cleaning agent is selected, and the hydrocarbon cleaning agent is cooperated with the client cases in the relatively mature industry and enterprises with specialized service systems to adopt excellent hydrocarbon cleaning agents; achieving good cleaning effect.
The dehydration type hydrocarbon cleaning agent can clean and remove water, cutting fluid, water-based cleaning agent and the like on the workpiece.
The antirust hydrocarbon cleaning agent has the advantages of cleaning and antirust, and can be suitable for cleaning easily rusted metals such as iron parts, carbon steel and the like, and the antirust period can reach 15-120 days.
The flux-removing type hydrocarbon cleaning agent can clean oil stains, dust and the like on a steel plate, and can also be applied to cleaning of flux, oil stains, dust and the like on parts such as electronic instruments, PCB (printed circuit board) and the like.
The carbon ash removal type hydrocarbon cleaning agent can clean oil stains and the like on a steel plate, and can also be applied to cleaning carbon black, powder, oil stains and the like on cylindrical stamping and stretching workpieces such as batteries, capacitors and the like.
The wax removal type hydrocarbon cleaning agent can clean waxiness oil stain on a steel plate, and can also be used for cleaning polishing wax on workpieces such as hardware, bathroom, clock electroplating, jewelry processing, lamp decoration manufacturing and the like.
The resin-type hydrocarbon cleaning agent is used for cleaning oil stains, natural resin, synthetic resin and the like on parts and equipment.
Drawings
Fig. 1 is a flow chart of a method for reducing oil re-coating and oil contamination on the surface of a steel coil in slitting processing according to an embodiment of the invention.
Fig. 2 is a flow chart of a heavy oil coating and oil stain cleaning method provided by the embodiment of the invention.
Fig. 3 is a schematic diagram of heavy oil coating and oil stain cleaning equipment provided by the embodiment of the invention.
In the figure: 1. a trough body; 2. a powerful vacuum pressure reducing system; 3. a cooling system; 4. a waste liquid treatment system; 5. a condensing system; 6. fluid infusion system.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The oil film cleaning machine aims at the problems that the oil film cleaning machine used for oil removal of the existing equipment is high in production cost and is a great economic burden for small and medium-sized enterprises or enterprises with few orders. The longitudinal shearing process of the invention slowly feeds materials, and a sprayer is used at the uncoiler to spray hydrocarbon cleaning agent on the surface of the material, and the hydrocarbon cleaning agent has the effects of removing oil, dissolving oil stain and preventing rust.
The technical solution of the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the method for reducing oil re-coating and oil contamination on the surface of a steel coil by slitting provided by the embodiment of the invention comprises the following steps:
s101: slowly feeding materials in the longitudinal shearing process, and spraying a hydrocarbon cleaning agent on the surface of the material at an uncoiler by using a sprayer;
s102: arranging personnel at the position of the winding machine to use a clean rag to wipe the surface and remove oil stains on the surface.
As a preferred embodiment of the invention, a wipe wiping method: the wiping is performed from left to right and from top to bottom in sequence.
As a preferred embodiment of the invention, the frequency of wipe changes is: and replacing the cleaning cloth with 10 steel coils each time.
As shown in fig. 2, the method for cleaning the heavy oil coating and oil contamination cleaning device provided in the embodiment of the present invention uses a sprayer to spray hydrocarbon cleaning agent on the surface of a material at an uncoiler, and the steel coil to be cleaned is cleaned by the heavy oil coating and oil contamination cleaning device, including:
s201, initial washing, ultrasonic immersion washing and throwing and rotating, cleaning for 3-30min by using carbonized water at normal temperature of-100 ℃, performing barrel type filtration, and cooling.
S202, fine washing, ultrasonic immersion washing and throwing, rotating, washing for 3-30min by using carbonized water at normal temperature of-100 ℃, performing barrel type filtration, and cooling.
S203, rinsing, ultrasonic immersion cleaning and throwing, rotating, cleaning with carbonized water for 3-30min at normal temperature of-100 ℃, and performing barrel filtration and cooling.
S204, cutting liquid, vacuum drying, high-speed air knife, rotary vacuum drying, high-speed hot air for 3-30min, filtering at RT-150 ℃, and exhausting.
And S205, recovering, and performing vacuum reduced pressure distillation recovery or multi-stage distillation recovery.
In the embodiment of the invention, heat conducting oil is adopted for heating, and forced cooling equipment is adopted for cooling.
In the embodiment of the invention, the hydrocarbon cleaning agent comprises a dehydration type hydrocarbon cleaning agent and an antirust type hydrocarbon cleaning agent.
In the embodiment of the invention, the hydrocarbon cleaning agent further comprises a fluxing agent removing type hydrocarbon cleaning agent and a soot removing type hydrocarbon cleaning agent.
In the embodiment of the invention, the hydrocarbon cleaning agent further comprises a wax removal type hydrocarbon cleaning agent and a resin removal type hydrocarbon cleaning agent.
As shown in fig. 3, the heavy oil coating and oil stain cleaning device provided by the invention comprises:
the groove body 1 is formed by welding stainless steel plates with the thickness of 8mm, is provided with a visual window, a waste oil and waste residue discharge pipe arranged at the bottom of a controllable operation vacuum groove, and is externally connected with a cooling box and a waste oil collecting box.
The lower part of the tank body is externally added with a hot oil bag, a heat conduction oil heating box is externally arranged, firstly, a heating pipe heats heat conduction oil, then, the heating oil is conveyed to the heating oil bag through a pump, and then, the heating oil is conveyed back to the heating box for heating after heat exchange, and the process is circulated; the heating oil bag is provided with an independent temperature control system, and the oil temperature is adjusted at R.T. -140 ℃.
The recovered cleaning agent is pumped into a vacuum distillation recovery tank through a pump, and before entering the vacuum recovery tank, the cleaning agent firstly enters a heat exchange cylinder to exchange heat with an HC steam pipe recovered by distillation; after vacuumizing, the cleaning agent is quickly boiled and evaporated to generate HC steam, which is condensed and recovered in a condensation area, and the recovered pure cleaning agent is discharged into a liquid storage tank for recycling.
The powerful vacuum decompression system 2 is provided with a vacuum decompression pump and a vacuum display meter; is provided with a vacuum motor and an electromagnetic valve; the high-temperature carbonized water quickly forms HC steam under the condition of reduced pressure, is pumped out of the recovery tank by a vacuum pump, forms liquid in the cooling tank again, and is filtered by activated carbon to form regenerated liquid for recycling.
The cooling system 3 is provided with a water cooler, continuously supplies cooling water for the vacuum recovery machine, and a part of the cooling water is supplied to two liquid storage tanks to prevent the cleaning agent from being heated.
Waste liquid treatment system 4, high temperature residue and waste oil that leave after vacuum distillation retrieves open through the valve, and the waste liquid gets into a cooler bin, passes through the cold water coil pipe at the cooler bin, carries out the heat exchange, and after cooling high temperature waste oil, collect in the waste oil tank, carry out centralized processing.
The condensing system 5 is provided with a cooling box for vacuum recovery, and cools the high-temperature HC steam to form liquid; a cooling box is needed in the waste oil treatment system, high-temperature waste oil is cooled and treated in a centralized manner, and a set of refrigerating unit is arranged to provide a cold source for equipment.
And the liquid supplementing system 6 is used for ensuring that the cleaning liquid of the distillation recovery tank meets the working requirements of the day, if the liquid level is too low, the float type liquid level control triggers the microswitch to send a signal and cut off a heating power supply of the tank, and the buzzer sends out an alarm to prompt that the cleaning liquid is insufficient and needs to be added with liquid from the outside.
During regeneration, the liquid of distillation accumulator will be distilled basically futilely, and the washing liquid after the regeneration is whole to be stored in the reservoir, and the washing liquid is not enough in the reservoir, inserts the pipe of taking special interface in the stock solution bucket, screws up the interface, opens the compressed air switch, and compressed air is impressed from stock solution bucket air inlet, extrudes the reservoir from the liquid outlet with the cleaner in, and when filling up the reservoir liquid level and reaching the high level, bee calling organ sent the warning, closes compressed air, finishes the fluid infusion.
In an embodiment of the present invention, the method for cleaning the heavy oil coating and oil contamination cleaning device further includes:
firstly, putting a steel coil to be cleaned into a washing basket, then putting the washing basket into an equipment feeding area, and lifting the washing basket to a cleaning main tank by controlling a mechanical arm by an operator; the cylinder drives the tank cover to automatically close the cleaning tank, the vacuum degassing system is started, and air in the tank is completely pumped out; pumping out gas in narrow gaps of a steel coil to be cleaned and gas contained in a cleaning agent in a vacuum state, starting ultrasonic waves, starting a swinging device, and driving a washing basket to rotate so that the cleaning agent can be fully cleaned; after the set time, the vacuum is released, the cover is opened by the driving of the air cylinder, and the basket is lifted out by the mechanical arm and enters the second groove for cleaning.
In the embodiment of the invention, the operating pressure of the heavy oil coating and oil stain cleaning equipment is 50-100 Torr, and the temperature is 90-120 ℃.
The waste liquid treatment system is also provided with a plurality of moistening tanks.
The invention is further described below with reference to specific assays.
(1) In the present invention, the cleaning principle of the nonaqueous cleaning agent is: the cleaning is performed according to the dissolving power of the solvent. The degreasing mechanism based on the solubility to grease or oily pollution is the principle of similar compatibility. Hydrocarbons such as gasoline and kerosene are easy to dissolve heavy oil, and other hydrocarbons are easy to be mutually soluble with similar halogenated hydrocarbons (carbon tetrachloride, trichloroethane, etc.). It is also based on that water can be miscible with compounds having OH similar to water structure such as R-COOH (lower fatty acid), R-OH (lower alcohol), etc. The solubility of different liquids is closely related to surface tension and interfacial tension. For example, the surface tension of a solvent such as benzene or cycloalkane is not much different from the surface tension of tar or lubricating oil, and the interfacial tension value between the two is close to easy compatibility. For the solubility of solvents to grease or oily dirt, the solubility of the solutions at certain temperatures of different solvents to solutes is higher as the separation temperature of the solutes is lower in the cooling process.
The KB value is the value used by the paint and coatings industry as a measure of the solvency of Tiana water, and means the number of ml of diluent required to precipitate kauri gum from 120g of standard kauri gum-butanol solution at 25 ℃, with higher KB values giving better solubility. The KB value has been used as an index for determining the dissolving power of a solvent for washing, but the KB value is the solubility in a resin and is not directly related to the washing power, and thus it is difficult to be used as a reference.
The solubility index of the solvent for washing has a solubility parameter SP value. The SP value is represented by the following formula:
SP value delta (△ E/V) △ E evaporation energy V molar volume.
Substances with similar SP values have similar energy of aggregation and are therefore easily dissolved in each other. This phenomenon is the rule of thumb for similar phase dissolution. The SP values of the respective substances are shown on the other page. The hydrocarbon-based cleaning agent has an SP value of 7 to 8, which is equal to the SP value (7 to 8) of the process oil, and therefore, is easily dissolved and has a high cleaning power. But are far from the SP value of the resin and thus are less prone to attack by these materials. Meanwhile, for dirt containing resin, the cleaning effect is poor due to poor solubility of alcohol. The SP value can be used as an index when selecting a cleaning agent, but it is dangerous to judge only by a numerical value, and it is necessary to evaluate the cleaning performance by an experiment using actual contaminated oil or the like.
(2) Factors affecting cleaning power:
chemical force-dissolving force … interfacial tension … surfactant (adjuvant) chemical reaction force ….
Physical force heating … promotes reaction of other cleaning factors, physical change of dirt, and physical change of the object to be cleaned. The ultrasonic waves … are strongly peeled and dispersed by cavitation action, acceleration, and direct current caused by ultrasound. Agitation … is agitation to promote contact between the surface being cleaned and fresh cleaning liquid, and prevents reattachment of the cleaning surface by homogenizing (shaking, mechanically promoting the removal of contaminants from the surface being cleaned, dispersing and rotating) the contaminants in the cleaning liquid. The reduced pressure … causes the reduced pressure fluid to penetrate into the fine areas, thereby causing the soil to swell and be removed. According to the factors influencing the cleaning force, the design and the configuration of the hydrocarbon cleaning equipment are targeted, for example, the configuration of a main cleaning functional tank is as follows, namely, the working principle is that in the first stage, an operator puts a steel coil to be cleaned into a washing basket, then the washing basket is put into an equipment feeding area, and the washing basket is lifted to the main cleaning tank by the mechanical arm controlled by the operator. At this time, the cylinder drives the tank cover to automatically close the cleaning tank, and the vacuum degassing system is started to completely pump out air in the tank. The gas in the narrow gap of the steel coil to be cleaned and the gas contained in the cleaning agent can be pumped out in a vacuum state, the ultrasonic wave is started, the swinging device is started, and the washing basket is driven to rotate, so that the cleaning agent can be fully cleaned; after the set time, the vacuum is released, the cover is opened by the driving of the cylinder, the washing basket is lifted out by the mechanical arm and enters the second groove for cleaning, as for the requirement of carrying out vacuum cleaning on a plurality of grooves, the vacuum cleaning is determined according to the substances such as oil stains and impurities on the surface of the steel coil and the yield of the steel coil.
The working procedures are as follows: cleaning engineering, cleaning mode cleaning medium, cleaning time, use temperature, filtering mode, heating mode, vacuum degassing and remarking.
1) Initial washing, ultrasonic immersion washing, throwing and rotating, alternative type of carbonized water for 3-30min can be adjusted, the temperature is adjusted to-100 ℃ according to selected cleaning liquid, and the steps of cylinder filtering, heat conducting oil heating and forced cooling are carried out.
2) Fine cleaning, ultrasonic immersion cleaning, throwing and rotating, wherein the type of the carbonized water can be adjusted within 3-30min alternatively, the cylinder type filtration can be adjusted according to the selected cleaning liquid at normal temperature-100 ℃, and the heat conducting oil is heated and forcibly cooled.
3) Rinsing, ultrasonic immersion cleaning, throwing and rotating, wherein the type of the carbonized water is alternatively selected for 3-30min and can be adjusted, and the cylinder type filtration, the heat conduction oil heating and the forced cooling can be adjusted according to the selected cleaning liquid at the normal temperature of-100 ℃.
4) Cutting liquid, vacuum drying, high-speed air knife, rotary vacuum drying, high-speed hot air for 3-30min, middle-effect filtering at RT-150 deg.C, electric heating, and exhausting.
5) Recovering, vacuum reduced pressure distilling and recovering, multi-stage distilling and recovering of carbonized water, and heating heat conducting oil.
The invention is further described below in connection with the characterization of hydrocarbon cleaning agents as being classified into normal hydrocarbons, iso-hydrocarbons, cyclo-hydrocarbons, and aromatic hydrocarbons.
Strong cleaning power to the metal working oil → good cleaning effect of the slit and pore part due to small surface tension.
Has good compatibility with liquid crystal dirt, especially biphenyl dirt.
Cleaning agent with cleaning effect for various dirt (water soluble processing oil, logic, flaks).
Does not corrode metal.
The influence on the resin is small → normal hydrocarbons, iso-hydrocarbons, cyclo-paraffins.
Most of hydrocarbon cleaning agents can be recycled through distillation, and the use is economical.
The invention is further described below in connection with cleaning agent selection.
1) Cleaning power
As described in the principle section of the nonaqueous cleaning agent, the cleaning power of the nonaqueous cleaning agent depends on the dissolution action. Contaminant process oils are also insoluble materials when they are mineral oils. Whether the selected cleaning agent can dissolve dirt or not needs a test in advance, so that the cleaning agent with good dissolving performance is selected.
2) Cleaning conditions
When the same cleaning agent is used to clean the same dirt, different cleaning effects can be obtained depending on the cleaning conditions (temperature, time, physical force, etc.). The higher the temperature and the longer the time, the better the cleaning effect is when physical acting force such as ultrasonic wave is thrown or added. It is necessary to perform the test under the same or more severe conditions as those under which the washer is actually used.
3) And disposability of waste
After the lotion is spent, the liquid is replaced and the waste liquid becomes waste. The hydrocarbon cleaning agent can be burnt and discarded due to the combustibility, and can be reused as fuel. However, the chlorine-containing cleaning agent cannot be handled by itself, and thus, it is required to entrust a special waste disposal company, which increases the cost. Therefore, it is necessary to select a cleaning liquid which is easy to handle to reduce the cost.
The invention is further described below in connection with a method of reducing residual oil.
1) And the amount of attached cleaning agent is reduced.
2) And the amount of processing oil adhering to the cleaning agent is reduced.
The method for adhering the cleaning agent is mainly determined by the shape of the steel coil, the surface roughness, the properties of the cleaning agent (surface tension, film thickness and the like), so that corresponding measures such as a liquid removing method (rotating for removing night and the like), a liquid removing time (long time), a temperature (reducing viscosity at high temperature) and the like are taken on cleaning equipment.
The method for reducing the amount of the processing oil in the adhered cleaning agent comprises the steps of arranging a wetting tank, increasing the number of the wetting tanks, cleaning equipment, finally cleaning by adopting new cleaning liquid, controlling the concentration of the processing oil in the wetting tank to be below a certain amount by using a distillation regenerator of the equipment, and the like.
The invention is further described below in connection with a distillation regeneration process.
The cleaning agent can be contaminated and deteriorated due to the contamination of the dirt (processing oil, grease, rust preventive oil, wax, liquid crystal, etc.) adhered to the object to be cleaned, the decomposition of the main component, the consumption of the additive, etc., and the cleaning agent can not be used any more as the deterioration of the contamination progresses. The distillation/regeneration apparatus performs reduced pressure distillation by utilizing the property that the boiling point of the liquid decreases with a decrease in pressure, and recovers only the cleaning agent in the cleaning liquid to treat the processing oil or the like as a waste liquid.
The impurities such as metal powder in the solvent are removed by a filter, the solvent is heated by a preheater to be vaporized, and the impurities are removed by a separation vessel. The regenerated solvent is liquefied by condensing gas, stays in the solvent recovery tank temporarily and returns to the cleaning tank.
The operation condition is that the pressure is 50-100 Torr and the temperature is 90-120 ℃, and the condition can be changed according to the properties of the cleaning liquid and the processing oil when the recovery rate of the recovered product with better purity is improved.
The distillation regenerator is selected as appropriate according to the requirements of the cleaning tank, the amount of the mixed process oil, the type of the process oil, the cleaning performance and the like.
Since the amount of mixed processing oil + α is discharged as the waste liquid, a regenerator suitable for processing a cleaning liquid mixed with a large amount of processing oil is selected.
If the cleaning effect cannot be ensured. A distiller was selected that could handle the liquid in the tank 1 time a day. For example, when the total amount of the liquid in the cleaning tank and the moistening tank is 360L and the working time is 8 h/day, the theoretical cleaning frequency of the liquid in the cleaning tank of the 30L/h distillation machine can reach 0.7 times/day. If the recovery rate of the distiller is 95%, the amount of waste liquid discharged per day is 12L/h × 0.05 × 8h — 12L/day, and if the distiller is operated for 25 days per month, 300L of cleaning liquid needs to be replenished. When the recovery rate was 98%, the system was operated for 25 days per month similarly to 4.8L/day at 30L/h × 0.02 × 8h, and 12L of the cleaning solution was added. The recovery rate of 3% is 2.5 times the loss amount.
The present invention is further described below in connection with a vacuum distillation recovery unit.
1) Trough body
Is welded from SUS316L stainless steel plate with thickness of 8mm, and effective dimension (L multiplied by W multiplied by H) of the groove body is phi 500 multiplied by 1200 mm. The vacuum tank is provided with observation structures such as a visual window, and a waste oil and waste residue discharge pipe, an external cooling box and a waste oil collecting box are arranged at the bottom of the vacuum tank convenient to operate in a controllable manner.
Heating by adopting a heat conduction oil indirect heating mode. The lower part of the tank body is externally provided with a heating oil bag, and a heat conducting oil heating box is externally arranged, and the heating power is 12 kW. Firstly, heating the heat conducting oil by a heating pipe, then conveying the heating oil to a heating oil bag by a pump, carrying out heat exchange, then conveying the oil back to a heating box for heating, and circulating the steps. The heating oil bag is provided with an independent temperature control system, and the oil temperature is adjustable from R.T. to 140 ℃.
The cleaning agent to be recycled is pumped into the vacuum distillation recycling tank through a pump, and before entering the vacuum recycling tank, the cleaning agent firstly enters a heat exchange cylinder to exchange heat with the HC steam pipe recycled by distillation. After vacuumizing, the cleaning agent is quickly boiled and evaporated to generate HC steam, which can be condensed and recovered in a condensation area, and the recovered pure cleaning agent is discharged into a liquid storage tank for recycling, thus having the functions of automatic liquid supplementing circulation and rinsing.
2) Powerful vacuum pressure reduction system
A vacuum decompression pump and a vacuum display meter are arranged. Is provided with a vacuum motor and an electromagnetic valve. The vacuum distillation recovery capacity is 200L/H, the boiling point of the water carbonide is 172 ℃ at normal temperature and normal pressure, the boiling point can be reduced under the condition of reduced pressure, the high-temperature water carbonide quickly forms HC steam under the condition of reduced pressure, the HC steam is pumped out of the recovery tank by a vacuum pump, liquid is formed in the cooling tank again, and the liquid is filtered by activated carbon to be called as regeneration liquid which can be recycled.
3) Cooling system
The vacuum recovery machine is provided with a 10HP water cooler, a Taikang compressor head is adopted, cooling water is continuously supplied to the vacuum recovery machine, and a part of cold water is supplied to two liquid storage tanks to prevent the cleaning agent from being heated.
The waste liquid treatment system is characterized in that high-temperature residues and waste oil left after vacuum distillation and recovery are subjected to valve opening, the waste liquid enters a cooling box, heat exchange is carried out on the waste liquid in the cooling box through a cold water coil pipe, the high-temperature waste oil is collected in a waste oil tank after being cooled, and centralized treatment is carried out.
The condensing system is provided with a cooling box for vacuum recovery, and high-temperature HC steam is cooled to form liquid; a cooling box is needed in the waste oil treatment system to cool and intensively treat the high-temperature waste oil. A set of refrigerating unit (consisting of a 10HP water chiller) is arranged for providing a cold source for the equipment.
4) Fluid infusion system
During normal work, the cleaning solution of distillation accumulator can satisfy the requirement of day work, if the liquid level crosses lowly, buoy type liquid level control touches micro-gap switch, sends out the signal and cuts off the heating power supply in this groove, and bee calling organ sends the warning, and the suggestion cleaning solution is not enough, needs outside liquid feeding.
During regeneration, the liquid of distillation accumulator will be distilled basically futilely, the washing liquid after the regeneration is all stored in the reservoir, if the washing liquid is not enough in the reservoir, operating personnel need insert the pipe (provided by the manufacturer) of taking special interface in the stock solution bucket (the stock solution bucket is the bucket that the supplier provided when purchasing the cleaner), screw up the interface, open the compressed air switch, compressed air is impressed from the stock solution bucket air inlet, extrude the cleaner to the reservoir from the liquid outlet, when always mending the reservoir liquid level and reach the high level, bee calling organ sends the warning, operating personnel closes compressed air, end fluid infusion.
The invention is further described below in connection with fire protection strategies.
1) Elements of combustion
The need of hydrocarbon cleaning agent establishes corresponding measures for fire prevention and explosion prevention.
In the past, kerosene and lamp oil are mostly used as cleaning agents, and the cleaning agents are used as Freon and trichloroethane substitute hydrocarbon cleaning agents newly used in fields, so that the aromatic use is reduced as much as possible, the environmental problem is fully considered, and the ignition point is correspondingly high in safety and good. In addition, a closed type pressure reduction steam cleaning possible system of the cleaning machine is also developed, and the safety is greatly improved.
In order to burn a hydrocarbon-based solvent having ignition performance, three conditions need to be satisfied:
pyrophoric steam is present.
And an ignition source.
Oxygen is present which is necessary for combustion.
These are called three elements of combustion, and even if one is missing, the solvent cannot be combusted.
The invention is further described below in connection with fire suppression condition control.
1) Gas concentration control
Avoiding the first condition "presence of pyrophoric vapors" is particularly important in selecting cleaning agents and cleaning systems. Specific measures are available.
a. To keep the steam concentration low, it is necessary to use appropriate converter means
b. Using solvents or the like under such conditions that the ignition temperature is low
Since the concentration of the cleaning gas around the cleaning tank is high by the operation of removing the non-cleaned object, the container, and the like due to the evaporation of the liquid surface of the cleaning apparatus, a forced exhaust function is provided outside the cleaning apparatus. The open cleaning apparatus without a cover must be sufficiently ventilated.
In the actual cleaning, the cases of the class 2 petroleum (the ignition point is 21-70 ℃) and the class three petroleum (the ignition point is 70-200 ℃) which are used according to the classification of the fire-fighting law are greatly increased because the drying performance is emphasized to use the class 2 petroleum recently.
In particular, it is recommended to use a cleaning tank having a temperature below 15 c of the ignition point when using an open system. This is because the alarm bell of the gas leak detector is set to 1/4 which is the lower explosion limit, and the equivalent vapor pressure is approximately 15 ℃ or less in terms of temperature at the ignition point. In summer or in combination with ultrasonic wave, the liquid temperature is likely to rise to 35 deg.C, so that the ignition point should be above 50 deg.C.
2) Isolated ignition source
The second condition "there is an ignition source" mainly addresses the safety management issues of the corresponding user of the cleaning system.
The specific strategy is to isolate point sources such as sparks and open fire. Explosion-proof type electrical components are used. To prevent the accumulation of static electricity, the cleaning machine should be completely grounded.
In order to block the ignition source, measures such as isolating the control unit from the cleaning unit and using an electromechanical component having explosion-proof performance are taken to prevent ignition spark from occurring in the electronic system and the sealed structure such as the cleaning liquid heater and the ultrasonic vibrator in the cleaning tank. In the cleaning operation, it is noted that there is no need to inject non-cleaning material at a high temperature, to prevent the cleaning material from approaching an open flame, to melt sparks, contact sparks, and the like.
Safety countermeasures to be taken with respect to the ignition source system:
the ring pump and the motor used by the supply and discharge pump should use a 'safe explosion-proof structure motor' or an 'air driving motor' and the like.
As a motor as a driving source for moving the object to be cleaned, a "safety booster explosion-proof structure motor" or an air cylinder (aircylinder) is used.
The motor of the fan for air supply uses a motor with a pressure-resistant explosion-proof structure.
The control panel adopts an internal pressure explosion-proof structure. This is because the internal pressure of the control panel is increased by the internal ignition source through air purification, and external combustible gas is not easy to intrude.
Similarly, the ultrasonic vibrator uses a high voltage inside the ultrasonic vibrator to serve as an ignition source, and an "internal pressure explosion-proof structure" is adopted.
The combustible material is heated by using an electric heater as a heating source, and when the liquid level is lowered, the surface of the heater exposed to the air becomes high in temperature, and at this time, if there is a combustible liquid, a combustible vapor is generated, and combustion is caused. Therefore, when a strong heating source is used, an indirect heating mode by steam is adopted. In addition, the cleaning machine should be grounded, and the cleaning agent for the object to be cleaned should not rub at high speed in an insulated state, so as to prevent static electricity, and how to prevent electrification should be considered. Practical cleaning equipment is to combine these measures to minimize fire and explosion.
3) And isolating oxygen
It is extremely difficult to isolate the oxygen necessary for combustion. This is because oxygen is necessary for breathing as long as someone is present in the working environment, and the oxygen required for combustion is isolated from the oxygen necessary for breathing. Therefore, it is considered that the cleaning tank is made of or enclosed in a gas, but it is not realistic to mix air into the cleaning tank when the object to be cleaned is taken in and out. Although there is a problem in safety in the use of steam cleaning and spray cleaning in an open system in the presence of oxygen, it is also possible to satisfy three requirements for preventing combustion by a pressure reduction operation.
In the alternative, the steps of reduced-pressure ultrasonic infiltration, reduced-pressure steam cleaning, vacuum drying and the like are completed in a tank, and the tank is a completely closed system under the reduced-pressure condition. Trichloroethane vapor cleaning has been used previously, and the use of hydrocarbon based cleaning agents (class 2 petroleum) in such systems reduces 1/3 consumption and may also significantly reduce the cost. The cleaning agent can be reused through the internal reduced pressure distillation regenerator.
4) Gas concentration detector and the like
The gas concentration detection alarm is a device which is installed at the lower part of the cleaning tank, monitors the concentration of the leaked gas at any time, and can give an alarm (generally, give an alarm when reaching 1/4 of the lower explosion limit concentration) in case of the steam concentration approaching the explosion limit.
In addition, a foam fire extinguisher is arranged at the opening of the cleaning tank, when a fire breaks out in the tank, the initial fire is detected through a temperature sensor, the equipment is automatically stopped when an alarm is given out, and a device capable of carrying out initial fire extinguishing performance in a short time in the tank can also be adopted.
As described above, if the three elements are not satisfied simultaneously, the occurrence of fire can be prevented. In order to prevent the situation that ten thousand countermeasures cannot work normally in actual equipment, a double protection measure (Feiyelsf scheme) for preventing three elements from being met simultaneously is also adopted. The method comprises the following steps:
a. the pressure-resistant explosion-proof structure is a totally-closed structure, when the explosive gas in the container explodes, the container bears the pressure, and the external explosive gas is not easy to ignite.
b. The intrinsically safe explosion-proof structure does not ignite explosive gas or steam due to sparks or heat when the machine operates normally and fails, and the circuit of the machine is confirmed to have the performance through ignition tests or other methods.
c. The safety explosion-proof structure is a structure which does not generate sparks or high temperature at the part which should not generate ignition spark or high temperature and particularly increases the safety in the structure and the temperature rising process.
d. The internal pressure explosion-proof structure is a structure which can continuously prevent the invasion of gas in operation while expelling the introduced explosive gas before the operation is started by sealing protective gas (such as normal air or inert gas) into the container.
The invention is further described below in connection with waste liquid treatment.
When the cleaning liquid in the cleaning tank cannot ensure the cleaning effect, the cleaning liquid is treated as waste liquid. If only one cleaning tank is used, the processing oil concentration in the tank exceeds the reference concentration, and then the cleaning tank is discarded completely. If the processing oil content reaches 2%, the cleaning effect cannot be ensured, and the processing oil is discarded together with 98% of the cleaning liquid. When the wetting tank is added to the cleaning tank and has two tanks and three tanks, the 1 st tank is completely abandoned when the processing oil concentration of the final tank reaches 2%, and the rear tank is moved to the front side to supplement new liquid for the final tank. The waste liquor of the distiller will be discarded when introduced into the distillation regenerator.
The waste oil boiler and the waste oil furnace are introduced into the liquid discharge treatment method.
The invention is widely used as ozone layer destructive substance or substitute of chlorine series solvent in heat treatment in steel industry since the use of hydrocarbon cleaning agent. The evaporation loss is less, so the use amount is less, the operation cost is lower, the adverse effect on the environment is avoided, and the cleaning performance can be fully ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The method for reducing the oil recoating and the oil contamination on the surface of the steel coil in the longitudinal shearing processing is characterized by comprising the following steps of:
firstly, feeding materials in a longitudinal shearing process, and spraying a hydrocarbon cleaning agent on the surface of a material at an uncoiler by using a sprayer;
and secondly, wiping the surface by using a clean rag at the position of the winding machine, and removing the oil stain on the surface.
2. The method for reducing the oil re-coating and the oil stain on the surface of the steel coil in the slitting process as claimed in claim 1, wherein in the first step, a hydrocarbon cleaning agent is sprayed on the surface of the material by using a sprayer at an uncoiler, the steel coil to be cleaned is cleaned by a device for cleaning the oil re-coating and the oil stain, and the method for cleaning the device for cleaning the oil re-coating and the oil stain comprises the following steps:
1) preliminary washing, ultrasonic immersion washing and throwing, rotating, washing with charring water for 3-30min at normal temperature of-100 deg.C, filtering in a cylinder, and cooling;
2) fine washing, ultrasonic immersion washing, polishing and rotating, washing with charring water for 3-30min at normal temperature of-100 deg.C, filtering in a cylinder, and cooling;
3) rinsing, ultrasonic immersion cleaning, rotating, cleaning with charring water for 3-30min at normal temperature-100 deg.C, filtering in a cylinder, and cooling;
4) cutting liquid, vacuum drying, high-speed air knife, rotary vacuum drying, high-speed hot air for 3-30min, filtering at RT-150 deg.C, and exhausting.
5) Recovering, vacuum distilling and recovering or multi-stage distilling and recovering.
3. The method for reducing oil and grease contamination on the surface of a steel coil by slitting as claimed in claim 2, wherein the steel coil is heated by heat transfer oil and cooled by a forced cooling device.
4. The slitting process as claimed in claim 2, wherein the hydrocarbon cleaning agent in the first step comprises a dehydration type hydrocarbon cleaning agent and a rust-proof type hydrocarbon cleaning agent.
5. The method for reducing oil and grease contamination on the surface of a steel coil in slitting process as claimed in claim 2, wherein the hydrocarbon cleaning agent in the first step further comprises a flux-assisting type hydrocarbon cleaning agent and a soot-removing type hydrocarbon cleaning agent.
6. The method of claim 2, wherein the hydrocarbon cleaning agent in the first step further comprises a wax-removing hydrocarbon cleaning agent and a resin-removing hydrocarbon cleaning agent.
7. The slitting process of claim 2, wherein in the second step, the wiping method comprises: sequentially wiping from left to right and from top to bottom; the frequency of replacing the cleaning cloth is as follows: and replacing the cleaning cloth with 10 steel coils each time.
8. A re-oiling and degreasing cleaning device for implementing the method for reducing re-oiling and degreasing on the surface of a steel coil by slitting process as claimed in claim 1, wherein the re-oiling and degreasing cleaning device comprises:
the tank body is formed by welding stainless steel plates with the thickness of 8mm, is provided with a visual window, and is externally connected with a cooling box and a waste oil collecting box, and a waste oil and waste residue discharge pipe is arranged at the bottom of the controllable operation vacuum tank;
the lower part of the tank body is externally added with a hot oil bag, a heat conduction oil heating box is externally arranged, firstly, a heating pipe heats heat conduction oil, then, the heating oil is conveyed to the heating oil bag through a pump, and then, the heating oil is conveyed back to the heating box for heating after heat exchange, and the process is circulated; the heating oil bag is provided with an independent temperature control system, and the oil temperature is regulated at R.T. -140 ℃;
the recovered cleaning agent is pumped into a vacuum distillation recovery tank through a pump, and before entering the vacuum recovery tank, the cleaning agent firstly enters a heat exchange cylinder to exchange heat with an HC steam pipe recovered by distillation; after vacuumizing, the cleaning agent is quickly boiled and evaporated to generate HC steam, and then the HC steam is condensed and recovered in a condensation area, and the recovered pure cleaning agent is discharged into a liquid storage tank for recycling;
a powerful vacuum decompression system, which is provided with a vacuum decompression pump and a vacuum display meter; is provided with a vacuum motor and an electromagnetic valve; the high-temperature carbonized water rapidly forms HC steam under the condition of reduced pressure, is pumped out of the recovery tank by a vacuum pump, forms liquid in the cooling tank again, is filtered by activated carbon to form regenerated liquid, and is recycled;
the cooling system is provided with a water cooler, continuously provides cooling water for the vacuum recovery machine, and supplies a part of the cooling water to the two liquid storage tanks to prevent the cleaning agent from being heated;
the waste liquid treatment system is used for carrying out heat exchange on high-temperature residue and waste oil left after vacuum distillation and recovery after a valve is opened, the waste liquid enters a cooling box, the cooling box is communicated with a cold water coil pipe for carrying out heat exchange, and the high-temperature waste oil is collected in a waste oil tank for centralized treatment after being cooled;
the condensing system is provided with a cooling box for vacuum recovery and cools the high-temperature HC steam to form liquid; a cooling box is needed in a waste oil treatment system, high-temperature waste oil is cooled and treated in a centralized manner, and a set of refrigerating unit is arranged to provide a cold source for equipment;
the liquid supplementing system is used for ensuring that the cleaning liquid in the distillation recovery tank meets the working requirements of the day, if the liquid level is too low, the float type liquid level control triggers the micro switch to send a signal and cut off a heating power supply of the tank, and the buzzer sends out an alarm to prompt that the cleaning liquid is insufficient and liquid needs to be added from the outside;
during regeneration, the liquid of distillation accumulator will be distilled basically futilely, and the washing liquid after the regeneration is whole to be stored in the reservoir, and the washing liquid is not enough in the reservoir, inserts the pipe of taking special interface in the stock solution bucket, screws up the interface, opens the compressed air switch, and compressed air is impressed from stock solution bucket air inlet, extrudes the reservoir from the liquid outlet with the cleaner in, and when filling up the reservoir liquid level and reaching the high level, bee calling organ sent the warning, closes compressed air, finishes the fluid infusion.
9. The heavy oil and grease cleaning apparatus according to claim 8, wherein the cleaning method of the heavy oil and grease cleaning apparatus further comprises:
firstly, putting a steel coil to be cleaned into a washing basket, then putting the washing basket into an equipment feeding area, and lifting the washing basket to a cleaning main tank by controlling a mechanical arm by an operator; the cylinder drives the tank cover to automatically close the cleaning tank, the vacuum degassing system is started, and air in the tank is completely pumped out; pumping out gas in narrow gaps of a steel coil to be cleaned and gas contained in a cleaning agent in a vacuum state, starting ultrasonic waves, starting a swinging device, and driving a washing basket to rotate so that the cleaning agent can be fully cleaned; after the set time, the vacuum is released, the cover is opened by the driving of the air cylinder, and the basket is lifted out by the mechanical arm and enters the second groove for cleaning.
10. The heavy oil and grease cleaning equipment according to claim 8, wherein the operating pressure of the heavy oil and grease cleaning equipment is 50-100 Torr and the temperature is 90-120 ℃;
the waste liquid treatment system is also provided with a plurality of moistening tanks.
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| CN201911041707.6A CN110871192A (en) | 2019-10-30 | 2019-10-30 | Method for reducing heavy oil coating and oil stain on surface of steel coil in longitudinal shearing processing |
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| CN201911041707.6A CN110871192A (en) | 2019-10-30 | 2019-10-30 | Method for reducing heavy oil coating and oil stain on surface of steel coil in longitudinal shearing processing |
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