JP3904344B2 - Oil smoke treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an oil smoke treatment apparatus, and in particular, an oil smoke treatment for treating oil smoke generated from a heat treatment material when the heat treatment material quenched in a heat treatment furnace (apparatus) is cooled with cooling oil and then transferred to a tempering furnace. Relates to the device.
[0002]
[Prior art]
When heat treatment is performed on a desired steel material, which is an example of a heat treatment material, a steel material is first put in a quenching furnace and heated for a predetermined time, and then the steel material taken out of the quenching furnace is immediately put in an oil bath. After cooling, the steel material pulled up from the oil tank after cooling is subjected to intermediate cleaning with a spray shower nozzle, and then put into a tempering furnace for tempering.
[0003]
In the series of heat treatment steps described above, when the steel material pulled up from the oil tank is put into the tempering furnace, the oil smoke generated from the steel material is sucked and collected by the suction fan through the duct, and the collected oil smoke is burned in the combustion furnace. Or filtered and exhausted outdoors.
[0004]
[Problems to be solved by the invention]
However, if the smoke generated in the heat treatment process is burned or filtered, the removal of the smoke is incomplete and causes air pollution. Also, the duct for guiding oil smoke to the combustion device has been long in the past, and oil has adhered to this duct causing a fire. Furthermore, conventional combustion and exhaust devices for oily smoke have problems of poor smoke evacuation efficiency and high running costs.
[0005]
Therefore, when considering why a large amount of problematic oil smoke is generated in a series of conventional heat treatment processes, firstly, deterioration of the cleaning water in the intermediate cleaning process can be mentioned. For steel materials with oil for cooling, the washing water is also clean at first, so the adhering oil can be washed away cleanly, but the washing water also emulsifies (emulsifies) when washed repeatedly. When the steel material is washed with this washing water, the washing accuracy is remarkably lowered.
[0006]
Then, considering why emulsification (emulsification) is promoted with respect to the water to be washed, when steel materials are washed with a spray-type shower nozzle that has been used in the intermediate washing process, the water is removed from the shower nozzle. When passing through the fine holes, the water passing through the holes is more strongly subjected to physical impact in the spray shower nozzle. Therefore, the washing water promotes emulsification. Moreover, since the heating method of water (washing water) in the conventional intermediate washing process was a method of heating the washing water tank itself, the temperature of the water in the whole washing water tank rose and became a factor of emulsification.
[0007]
Furthermore, the dipping of the cleaning method is mentioned. This is because the steel material is pulled up from the cooling oil bath at a temperature of about 80 ° C. and immersed in the cleaning water (dipping), and then shower-washed. At the time of this immersion (dipping), the temperature of the cleaning water is the steel material. However, the temperature of the cleaning water is currently lower than the steel material temperature. Therefore, the steel material is cooled at the time of dipping (dipping), the viscosity of the oil adhering to the steel material becomes hard, and the washing accuracy is not improved even if the washing water is subsequently applied to the steel material.
[0008]
The present invention has been developed in view of the above points. The object of the present invention is to prevent emulsification of washing water by preventing emulsification of washing water, and to suppress oil in smoke generated from the heat treatment material. To prevent air pollution caused by oily smoke and to eliminate the occurrence of fire from the duct due to the adhesion of oil (oil mist), and to provide an oily smoke treatment device that can effectively extinguish oily smoke is there.
[0009]
[Means for Solving the Problems]
In order to effectively achieve the above object, the present invention is configured as follows. That is, the oil smoke treatment device of the present invention is an intermediate treatment device that recovers the cooling oil adhering to the heat treatment material conveyed by the conveyance device and allows the heat treatment material to be washed and conveyed to the tempering furnace, A combustion device provided near the entrance of the tempering furnace to combust oil smoke generated from the heat-treated material conveyed from the intermediate processing device side to the tempering furnace side, and the oil smoke is sucked into the combustion device and combusted by the combustion device. The water or hot water supplied from the water tank provided in the intermediate processing device provided so as to communicate with the combustion device and the suction fan that exhausts the exhaust gas of the oily smoke outside the combustion device can be heated by the combustion heat due to the combustion of the oil smoke And a shower device for cleaning the cooling oil adhering by pouring hot water heated by the heat exchanger onto the heat treatment material conveyed in the intermediate processing device. It is configured me.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
As shown in the figure, the oil smoke treatment apparatus 1 of the present invention is disposed between the quenching furnace 3 and the tempering furnace 4 constituting the heat treatment apparatus 2 and suppresses the generation of oil smoke from the heat treatment material during the heat treatment. At the same time, the oil contained in the oil smoke is effectively removed so that the exhaust gas can be treated. 1 to 3 are simplified explanatory diagrams. For convenience of explanation, a part of the drawing is omitted, or a portion to be indicated by a broken line is indicated by a solid line to make it easy to understand a main part of each part.
[0011]
First, the above heat treatment apparatus 2 for heat treating a heat treatment material (work) such as steel formed in various shapes shows a quenching furnace 3, an oil tank 5, a pulling conveyor 6, an oil smoke treatment apparatus 1 and a tempering furnace 4. (See FIGS. 1 and 2).
[0012]
For example, a known mesh belt type continuous heat treatment furnace is used as the quenching furnace 3. Of course, a heat treatment furnace having any structure may be used as long as the heat treatment material can be quenched. The heat treatment material A is quenched while being conveyed by the conveyor 7 in the quenching furnace 3.
[0013]
The quenched heat treatment material A falls into the oil tank 5 from the chute 8 which is a discharge port provided at the end of the quenching furnace 3.
[0014]
The oil tank 5 is filled with oil for cooling a heated heat treatment material (not shown). In the oil tank 5, a pulling conveyor 6 (conveying device) is provided for pulling up the heat treatment material that has been charged. As the pulling conveyor 6, a mesh belt conveyor is used. The heat treatment material introduced into the oil tank 5 from the chute 8 falls to the upper surface on one end side of the pulling conveyor 6, is transported through the oil tank by the driving of the pulling conveyor 6, and is pulled up from the oil tank. During this time, the heat treatment material is cooled by oil.
[0015]
The heat treatment material pulled from the oil tank 5 by the pulling conveyor 6 falls to the oil smoke treatment device 1 side.
[0016]
That is, the oil smoke treatment device 1 dropped onto the transport conveyor 9 (for example, a mesh belt conveyor) as a transport device for transporting the heat-treated material dropped from the pulling conveyor 6 to the tempering furnace 4 side, and the transport conveyor 9. The water tank 10 that receives oil dripping from the heat treatment material, the shower device 11 for forcibly washing off the oil adhering to the heat treatment material conveyed by the conveyor 9 by spraying hot water (or water), and the water tank 10 A sub tank 30 (see FIG. 2) that collects floating oil, an oil skimmer 12 that is provided in the sub tank 30 and separates oil and water, an oil recovery tank 13 that collects oil separated by the oil skimmer 12, and a water tank 10 hot water (or water) from a heat exchanger 14 to be described later to a shower device 11, a reduction gear 15 b and a motor 15 c. A pump 15, a strainer 16 (see FIG. 3) provided in a pipe on the suction port side of the pump 15, a hood 18 provided above the vicinity of the inlet 17 of the tempering furnace 4, and a heat treatment material via the hood 18 A combustion device 19 that combusts oil contained in oil smoke generated from the suction device, and a suction fan 20 that sucks the oil smoke into the combustion device 19 and exhausts the exhaust gas of the oil smoke combusted by the combustion device 19 to the outside of the combustion device 19 (FIG. 2). 3), and the water or hot water supplied from the water tank 10 is heated by the combustion heat (combusted with water or hot water). The heat exchanger 14 that exchanges heat with heat) and other various valves are used.
[0017]
Further, the intermediate processing device 21 is a heat treatment material that has been transported by the pulling conveyor 6 by the transport conveyor 9, water tank 10, shower device 11, oil skimmer 12, oil recovery tank 13, sub tank 30, pump 15, and strainer 17. It collects the oil adhering to the water and cleans the heat treatment material so that it can be conveyed to the tempering furnace 4. Of course, the intermediate processing device 21 is not limited to the above-described configuration, and various design changes may be made as long as the oil adhering to the heat treatment material can be recovered and washed and transported to the tempering furnace 4.
[0018]
The combustion device 19 can combust the oil smoke flowing into the combustion device by igniting the gas injected from the gas burner 22 (see FIG. 3). A suction fan 20 is provided on the upper portion of the combustion device 19 so that the exhaust gas of burned oil smoke can be discharged out of the combustion device. The amount of attracted oil smoke can be arbitrarily set by controlling the suction flow rate of the suction fan 20.
[0019]
Further, a heat exchanger 14 is provided on the upper portion of the combustion device 19. This heat exchanger 14 is provided with a pipe 24 spirally in a heat exchange vessel 23 so that water or hot water flowing in the pipe 24 can be warmed by the combustion heat of oil smoke from the combustion device 19.
[0020]
One end of the pipe of the heat exchanger is connected to the pipe 25 connected to the water tank 10 and the sub tank 30 via the pump 15 or the like, and the other end is connected to the pipe 26 of the shower device 11.
[0021]
The shower device 11 includes a pipe 26 connected to the pipe 24 of the heat exchanger, and two shower nozzles 27 and 28 provided on the other end side of the pipe 26. Each shower nozzle 27, 28 has a cylindrical shape with one end sealed, and a large number of holes (not shown) are formed along the longitudinal direction. The shower nozzles 27 and 28 (see FIG. 1) are provided in parallel with an appropriate interval above the transport conveyor 9 so as to cross the transport conveyor 9. The shower nozzles 27 and 28 are provided at substantially the same interval with respect to the upper surface of the conveyor 9 provided on the upper right side of the drawing (see FIG. 1). Of course, the shower nozzles 27 and 28 may be provided at different intervals from the upper surface of the conveyor 9. The water or hot water warmed by the heat exchanger 15 pours from the shower nozzles 27 and 28 with respect to the heat treatment material transported by the transport conveyor 9. From each of the shower nozzles 27 and 28, a large amount of water or hot water pours into the heat treatment material in a waterfall shape so that the oil adhering to the heat treatment material can be washed away.
[0022]
One shower nozzle or three or more shower nozzles may be provided. If the water (warm water) can pour onto the upper surface of the transport conveyor 9 in a waterfall shape, the shape and size of the shower nozzles 27 and 28 and the diameter, shape and arrangement of the holes may be freely changed. Of course, the hole of the shower nozzle has a larger diameter than the hole of the conventional spray nozzle so that hot water or water can pour down into a waterfall.
[0023]
Next, the case where heat processing material is heat-processed with the heat processing apparatus 2 provided with the oil smoke processing apparatus 1 mentioned above is demonstrated.
The heat treatment material is quenched by a quenching device (not shown) while being conveyed through the furnace by a conveyor 7 provided in the quenching furnace 3.
[0024]
The heat-treated material that has passed through the quenching furnace 3 is charged into an oil tank 5 filled with cooling oil from a chute 8 provided on one end side of the conveyor 7 and cooled.
[0025]
The heat-treated material put into the oil tank 5 falls on one end side of the pulling conveyor 6, and is driven through the oil tank 5 and pulled up by driving the pulling conveyor 6. The heat treatment material has cooling oil attached to the entire surface.
[0026]
The heat treatment material pulled up from the oil tank 5 by the pulling conveyor 6 is guided to the intermediate processing device 21 side. That is, the heat treatment material dropped from one end of the pulling conveyor 6 is placed on the upper portion of one end side of the transfer conveyor 9 provided in the water tank 10 and is transferred to the tempering furnace 4 side. During this transfer, hot water of about 40 ° C. to 50 ° C. is poured from the shower nozzles 27 and 28 of the shower device 11 onto the heat treatment material on the transfer conveyor 9 and adheres to the surface of the heat treatment material. Wash away the oil. This oil falls into the water tank 10 together with hot water from the gap of the pulling conveyor 6 (mesh belt conveyor). In the water tank 10, oil and water are separated and the oil floats in the upper layer. This upper layer oil is led to the sub tank 30 through the connecting passage 29 by overflow. In this case, the oil flows into the sub tank 30 together with some hot water. The hot water and oil in the sub-tank 30 are guided by the oil skimmer 12 to the oil recovery tank 13 and recovered.
[0027]
On the other hand, the heat-treated material conveyed by the conveyor 9 is conveyed to the inlet 17 side of the tempering furnace 4 and falls onto the conveyor 31 (see FIG. 1) provided in the tempering furnace 4. It is conveyed into the furnace 4 and tempered.
[0028]
At the inlet 17 of the tempering furnace 4, oil smoke generated from the heat treatment material is introduced into the combustion device 19 through the hood 18 by the suction fan 20. In the combustion device 19, the oil smoke is burned by the gas burner 22. In this case, the temperature in the combustion device 19 is set to be equal to or higher than the combustion decomposition temperature of oil, so that the oil smoke becomes complete combustion exhaust gas. Thus, the oil smoke is exhausted out of the combustion device 19 by the suction fan 20 as complete combustion exhaust gas (or combustion exhaust gas).
[0029]
The combustion heat generated when oil smoke is burned in the combustion device 19 is used to warm water or hot water flowing in the shower device 11. That is, the water or hot water of the water tank 10 and the sub tank 30 is guided through the strainer 16 by the pump 15 into the pipe 24 of the heat exchanger 23 provided so as to communicate with the combustion device 19. The water or hot water in the pipe 24 is heated to about 40 ° C. to 50 ° C. by the combustion heat, and poured from the shower nozzles 27 and 28 onto the heat treatment material on the transport conveyor 9. The oil adhering to the surface of the heat treatment material is washed away from the heat treatment material more effectively than the water by the hot water. The water or hot water in the water tank 10 and the sub-tank 30 is effective in separating oil from the oil as long as it is as stationary as possible. Therefore, the water intake pipe 25 a connected to the pump 15 is connected to the water tank 10 and the sub-tank 30. It is provided at the bottom.
[0030]
【The invention's effect】
As described above, the oil smoke treatment apparatus of the present invention can perform exhaust gas treatment by combusting the generated oil smoke before feeding into the tempering furnace by providing the heat treatment material from the quenching furnace to the tempering furnace. In addition, a long duct for guiding oil smoke to the combustion device is not provided as in the prior art, and it is possible to prevent as much as possible that oil from the oil smoke adheres to the duct and causes a fire. Also, the temperature of the water or hot water flowing through the heat exchanger is raised using the combustion heat generated by burning the oil smoke in the combustion device, and this hot water cools the heat treatment material that is transported to the tempering furnace side by the transport device. By washing away the oil for use, the oil adhering to the heat treatment material can be effectively removed. Moreover, emulsification of hot water or water can be suppressed, and oil smoke generated from the heat treatment material can be suppressed as much as possible.
[0031]
[Brief description of the drawings]
FIG. 1 is an explanatory view of a part of a heat treatment apparatus provided with an oil smoke treatment apparatus of the present invention as seen from the front.
FIG. 2 is an explanatory view of a part of a heat treatment apparatus provided with the oil smoke treatment apparatus of the present invention as viewed from above.
FIG. 3 is a simplified explanatory diagram of an oil smoke processing apparatus of the present invention.
[Explanation of symbols]
1 Oil Smoke Treatment Device 2 Heat Treatment Device 3 Quenching Furnace 4 Tempering Furnace 5 Oil Tank 6 Conveying Device (Pulling Conveyor)
DESCRIPTION OF SYMBOLS 10 Water tank 11 Shower apparatus 14 Heat exchanger 17 Tempering furnace inlet 19 Combustion apparatus 20 Suction fan 21 Intermediate processing apparatus

Claims (1)

An intermediate processing device that recovers the cooling oil adhering to the heat treatment material conveyed by the conveying device and that can be cleaned and conveyed to the tempering furnace, and provided in the vicinity of the inlet of the tempering furnace Combustion device for burning oil smoke generated from the heat treatment material conveyed from the treatment device side to the tempering furnace side, and exhausting the exhaust gas of the oil smoke sucked into the combustion device and combusted by the combustion device to the outside of the combustion device A suction fan, a heat exchanger provided in communication with the combustion device, and water or hot water supplied from a water tank provided in the intermediate processing device, which can be heated by combustion heat caused by combustion of oil smoke, and the heat The hot water heated by the exchanger is poured onto the heat treatment material transported in the intermediate processing device, and is composed of shower equipment for cleaning the cooling oil adhering thereto. Oily smoke processing equipment.

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