CN109821898B - Method for realizing low energy consumption and low oil mist emission in cold continuous rolling process - Google Patents
Method for realizing low energy consumption and low oil mist emission in cold continuous rolling process Download PDFInfo
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Abstract
The invention discloses a method for realizing low energy consumption and low oil mist emission in a cold continuous rolling process, which is characterized in that an infrared imaging temperature measuring instrument is arranged at an outlet of a rack at the tail end of a cold continuous rolling mill, the temperature of a plate surface at the outlet of the rolling mill is detected, an upper surface working roll spray and a lower surface working roll spray at the inlet of each rack respectively spray emulsion to a roll gap area at the inlet of an upper working roll and a lower working roll spray, an upper surface spray and a lower surface spray at the outlet of each rack respectively spray emulsion to a roll gap area at the outlet of the upper working roll and the lower working roll, and an upper surface cooling spray beam between racks and a lower surface cooling spray beam between racks are arranged between the racks. The invention not only realizes the aim of low energy consumption in the rolling process, but also realizes the aim of low oil mist emission in the rolling process, and has important significance for improving the environmental protection property in the cold rolling process.
Description
Technical Field
The invention relates to a pickling and rolling technology of metallurgical machinery, in particular to a method for realizing low energy consumption and low oil mist emission in a cold continuous rolling process.
Background
In the cold continuous rolling process, because the temperature of the plate surface at the outlet of the rolling mill is high, when the temperature exceeds 100 ℃, an oil-water mixture (emulsion residue) attached to the plate surface can volatilize rapidly under the action of high temperature, so that the oil mist phenomenon at the outlet of the rolling mill is obvious. Under the current large background that the environmental protection requirement is increasingly strict, the environmental monitoring department also makes more strict requirements on the oil mist discharge of the rolling mill. In the actual production process, this problem can only be alleviated by increasing the power of the mill outlet draft gear at present. However, the total amount of oil mist volatilized during the actual rolling process is not effectively controlled, and the outlet of the rolling mill is a relatively open space, so the actual effect is not good. Meanwhile, in the cold rolling process, when the temperature of the strip steel exceeds 70 ℃, the strip steel can generate ductile-brittle transition, the processing performance of the material can be improved, and the rolling load under the same deformation can be obviously reduced. Therefore, the temperature of the strip steel is required to reach a certain degree in the cold rolling process, the energy consumption loss in the rolling process can be effectively reduced, and the method is also favorable for realizing the high environmental protection requirement in the rolling process.
By combining the above analysis, the material can be expected to reach more than 70 ℃ in the processing process in the cold rolling process, so as to realize the ductile-brittle transition of the material in the rolling process, reduce the rolling load and realize low-energy-consumption rolling. Meanwhile, the temperature of the outlet plate surface of the rolled strip steel is expected to be below 100 ℃ so as to reduce excessive discharge caused by the volatilization of a large amount of residual emulsion on the plate surface. Although the influence of the plate surface temperature states in different rolling processes on the rolling process is clear, the corresponding technology is not combined with the plate surface temperature state for targeted control at present.
Patent application No. CN201410509986.5 discloses an oil mist sampling system and an analysis method of a cold rolling mill, namely, a sampling gun with a filter cartridge is used for sampling smoke at a constant speed in the sampling system, the collected smoke is absorbed by an impact absorption bottle arranged on a temperature control cooling device, and each sensor respectively detects the temperature, the flow speed and other data of the smoke and processes the data by a micro-processing unit; the analysis method takes cleaning fluid on the inner wall of a bent pipe of a sampling gun, glass fiber filter cylinders and absorption liquid in an impact absorption bottle as samples collected by three parts of smoke and carries out corresponding treatment, and an infrared spectrophotometer is used for analyzing and calculating the oil mist content of each collected sample to obtain the total oil mist content of a cold rolling mill production site. The sampling system realizes effective collection of the oil mist on the production site, and the collected oil mist is analyzed and processed by an analysis method to obtain analysis data of oil mist pollution on the production site. The method mainly relates to an oil mist sampling system and an analysis method of a cold rolling mill, which are used for analyzing oil mist generated in a cold rolling process, but can not solve the problem of reducing the oil mist discharge amount.
Patent application No. CN200920026673.9 discloses a two-stand cold rolling unit rolling oil mist is collected and is purified recovery unit, respectively set up an oil mist collection cover directly over unit entrance side and outlet side, collect rolling oil mist, the oil mist after the collection is in proper order through collecting the branch pipe and being responsible for, the fire prevention valve gets into the oil mist separator, oil mist is through the supercooling and filtering in the separator, more than 90% oil mist becomes liquid emulsion and collects and to get into the oil collection hole through the fluid-discharge tube in the separator bottom, other 10% oil mist passes through the fan and discharges up to standard through the chimney. The device recovers the oil mist generated in the cold rolling process, and cannot solve the problem of reducing the oil mist discharge amount.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: by the method for low energy consumption and low oil mist emission in the cold continuous rolling process, the low energy consumption target in the rolling process is realized, the low oil mist emission target in the rolling process is also realized, and the environmental protection property in the cold rolling process is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for realizing low energy consumption and low oil mist emission in the cold continuous rolling process comprises the steps of installing an infrared imaging temperature measuring instrument at an outlet of a rack at the tail end of a cold continuous rolling mill, detecting the temperature of a plate surface at the outlet of the mill, communicating and connecting the infrared imaging temperature measuring instrument with a process machine, arranging an inlet upper surface working roll spray and an inlet lower surface working roll spray on each rack, respectively spraying emulsion to a roll gap area at the inlet side of an upper working roll and a lower working roll, arranging an inlet upper surface roll gap spray and an inlet lower surface roll gap spray, respectively spraying emulsion to roll gap areas of an upper middle roll, a lower middle roll and a supporting roll, respectively spraying emulsion to a roll gap area at the outlet side of the upper working roll and the lower working roll, arranging an inter-rack upper surface spray and an inter-rack lower surface spray between racks between the racks, controlling the temperature of strip steel between the racks, arranging a, the process machine automatically adjusts to control the shape of the plate according to the outlet shape condition, the process machine carries out state detection on the upper surface spraying MT between the racks and the lower surface spraying MB between the racks behind one to four racks in the system and controls the opening and closing of the MT and the MB, the upper surface spraying MT between the racks comprises the upper surface spraying between one rack and two racks, the upper surface spraying between two racks and three racks, the upper surface spraying between three racks and four racks, and the upper surface spraying between four racks and five racks, and the lower surface spraying MB between the racks comprises the lower surface spraying between one rack and two racks, the lower surface spraying between two racks and three racks, the lower surface spraying between three racks and four racks, and the lower surface spraying between four racks and five racks.
The temperature measuring period of the temperature measuring instrument is executed according to 1s, the actual temperature sampling is carried out according to the time range of 60s-300s, the target temperature interval is set to be 70-100 ℃, and the analysis is carried out by using a five-stand cold continuous rolling machine.
The specific control process is as follows:
(1) monitoring the temperature of the outlet plate surface by using an infrared imaging thermometer at the outlet of the rolling mill, and outputting no control signal when the temperature is more than or equal to 70 ℃ and less than or equal to 100 ℃;
(2) when an infrared imaging thermometer at the outlet of a rolling mill monitors that the temperature of a plate surface is lower than 70 ℃, a control signal is output to a process machine, the process machine carries out state detection on the upper surface spray MT between frames and the lower surface spray MB between frames after one frame to four frames in a system, if the MT and the MB are both in an open state, the upper surface spray between one frame and two frames and the lower surface spray between one frame and two frames are firstly closed, the infrared imaging thermometer monitors the temperature after closing in an actual temperature sampling period, if the temperature is higher than 70 ℃, the temperature monitoring is continuously carried out according to a normal program, if the temperature is still lower than 70 ℃, the upper surface spray between two frames and three frames and the lower surface spray between two frames and three frames are closed, the infrared imaging thermometer monitors the temperature after closing in an actual temperature sampling period, and so on, if the temperature is lower than 70 ℃, finally, all cooling sprays behind one to four racks are closed, if all cooling sprays are closed, the temperature is still lower than 70 ℃, and the system prompts alarm information to suggest operators to intervene;
(3) when the temperature of the plate surface is monitored to be higher than 100 ℃ by an infrared imaging thermometer at the outlet of the rolling mill, the process machine carries out state detection on the upper surface spray MT between the frames and the lower surface spray MB between the frames after one to four frames in the system, if the MT and the MB are both in a closed state at the moment, the upper surface spray between the four frames and the five frames and the lower surface spray between the four frames and the five frames are firstly started, the infrared imaging thermometer after being started monitors the temperature after an actual temperature sampling period, if the temperature is lower than 100 ℃, the temperature monitoring is continued according to a normal program, if the temperature is still higher than 100 ℃, the upper surface spray between the three frames and the four frames and the lower surface spray between the three frames and the four frames are started, the infrared imaging thermometer after being started monitors the temperature after an actual temperature sampling period, and so on, if the temperature is higher than 100 ℃, all cooling sprays after four to one frame are finally started, if the temperature is still higher than 100 ℃ after the system is completely started, the system prompts alarm information to suggest an operator to intervene.
The method for realizing low energy consumption and low oil mist emission in the cold continuous rolling process has the beneficial effects that: the method not only realizes the aim of low energy consumption in the rolling process, but also realizes the aim of low oil mist emission in the rolling process, and has important significance for improving the environmental protection in the cold rolling process.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic structural view of a five stand tandem cold mill system of the present invention;
FIG. 2 is a flow chart of the five stand tandem cold mill system operation of the present invention.
In the figure: ETW-inlet upper surface working roll spraying, EBW-inlet lower surface working roll spraying, ETM-inlet upper surface roll gap spraying, EBM-inlet lower surface roll gap spraying, DT-outlet upper surface spraying, DB-outlet lower surface spraying, 5 SP-fine cooling spraying, MT 1-first rack and second rack upper surface spraying, MT 2-second rack and three rack upper surface spraying, MT 3-three rack and four rack upper surface spraying, MT 4-four rack and five rack upper surface spraying, MB 1-first rack and two rack lower surface spraying, MB 2-two rack and three rack lower surface spraying, MB 3-three rack and four rack lower surface spraying, MB 4-four rack and five rack lower surface spraying.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The first embodiment is as follows:
in a certain five-stand cold continuous rolling mill, an infrared imaging thermometer is installed at the outlet of a five-stand of the rolling mill, the precision of the infrared imaging thermometer is +/-1 ℃, the temperature of the plate surface at the outlet of the rolling mill is detected, the temperature measurement period of the infrared imaging thermometer is executed according to 1s, and the actual temperature sampling is carried out according to 120s to carry out value feedback in consideration of the effectiveness of system operation.
In the production process, an infrared imaging temperature measuring instrument at the outlet of the rolling mill monitors the temperature of the outlet plate surface, the temperature detection value of the first period is 90 ℃, and no control signal is output. The temperature detection value of the second period is 92 ℃, no control signal is output, and the temperature signal is continuously sent every 120s and compared with the target value of the system for analysis.
Example two:
in a certain five-stand cold continuous rolling mill, an infrared imaging temperature measuring instrument is arranged at the outlet of the five stands of the rolling mill, the precision of the infrared imaging temperature measuring instrument is +/-1 ℃, and the temperature of the plate surface at the outlet of the rolling mill is detected. The temperature measurement period of the infrared imaging thermometer is executed according to 1s, and the actual temperature sampling is subjected to value feedback according to 120s in consideration of the effectiveness of system operation.
In the production process, an infrared imaging temperature measuring instrument at the outlet of the rolling mill monitors the temperature of the outlet plate surface, the first period temperature detection value is 99 ℃, and no control signal is output. The temperature detection value of the second period is 103 ℃, and from the viewpoint of reducing the oil mist emission in the rolling process, the plate surface temperature in the rolling process needs to be reduced. At this time, the process machine detects the states of the inter-rack upper surface spray MT and the inter-rack lower surface spray MB after one to four racks in the system, and confirms that the sprays are all in the off state, so that the four racks are firstly opened and then the cooling sprays (MT4 and MB4) are cooled. After 120s, a third detection periodic signal is sent to the process machine, the measured plate surface temperature is 102 ℃, and from the viewpoint of reducing the oil mist emission in the rolling process, the plate surface temperature in the rolling process needs to be reduced. After the three racks were turned on, cooling sprays (MT3 and MB3) were cooled. And after the interval of 120s, sending a fourth detection periodic signal to the process machine, measuring the temperature of the plate surface to be 99 ℃, and meeting the temperature requirement. And subsequently, the temperature signal is continuously sent every 120s and is compared with the target value of the system for analysis.
The method for low energy consumption and low oil mist emission in the cold continuous rolling process realizes the low energy consumption target in the rolling process and the low oil mist emission target in the rolling process, and has important significance for improving the environmental protection property in the cold rolling process. Aiming at the incoming material characteristics of different cold continuous rolling mills, corresponding parameters can be set in a targeted manner, so that the method can be widely applied to the cold continuous rolling mills.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (3)
1. A method for realizing low energy consumption and low oil mist emission in a cold continuous rolling process is characterized by comprising the following steps: installing an infrared imaging thermometer at the outlet of a rack at the tail end of a cold continuous rolling mill to detect the temperature of the plate surface at the outlet of the rolling mill, wherein the infrared imaging thermometer is in communication connection with a process machine, each rack is provided with an inlet upper surface working roll spray (ETW) and an inlet lower surface working roll spray (EBW) which respectively spray emulsion on the roll gap areas at the inlet sides of an upper working roll and a lower working roll, an inlet upper surface roll gap spray (ETM) and an inlet lower surface roll gap spray (EBM) are arranged, emulsion is respectively sprayed on the roll gap areas of an upper middle roll, a lower middle roll and a supporting roll, an outlet upper surface spray (DT) and an outlet lower surface spray (DB) are respectively sprayed on the roll gap areas at the outlet sides of the upper working roll and the lower working roll, an inter-rack upper surface spray MT and an inter-rack lower surface spray MB are arranged between the racks and are used for controlling the strip steel temperature, according to the condition of the outlet plate shape, the process machine automatically adjusts to control the plate shape, the process machine carries out state detection on the upper surface spray MT between the racks and the lower surface spray MB between the racks behind one to four racks in the system and controls the opening and closing of the MT and the MB, the upper surface spray MT between the racks comprises the upper surface spray MT1 between one rack and two racks, the upper surface spray MT2 between two racks and three racks, the upper surface spray MT3 between three racks and four racks and the upper surface spray MT4 between four racks and five racks, and the lower surface spray MB between the racks comprises the lower surface spray MB1 between one rack and two racks, the lower surface spray MB2 between two racks and three racks, the lower surface spray MB3 between three racks and four racks and the lower surface spray MB4 between four racks and five racks.
2. The method for realizing low energy consumption and low oil mist emission in the cold continuous rolling process as claimed in claim 1, is characterized in that: the temperature measuring period of the temperature measuring instrument is executed according to 1s, the actual temperature sampling is carried out according to the time range of 60s-300s, the target temperature interval is set to be 70-100 ℃, and the analysis is carried out by using a five-stand cold continuous rolling machine.
3. The method for realizing low energy consumption and low oil mist emission in the cold continuous rolling process as claimed in claim 2, is characterized in that: the specific control process is as follows:
(1) monitoring the temperature of the outlet plate surface by using an infrared imaging thermometer at the outlet of the rolling mill, and outputting no control signal when the temperature is more than or equal to 70 ℃ and less than or equal to 100 ℃;
(2) when the temperature of the plate surface is monitored to be lower than 70 ℃ by an infrared imaging thermometer at the outlet of the rolling mill, a control signal is output to a process machine, the process machine carries out state detection on the upper surface spray MT between the frames and the lower surface spray MB between the frames after one frame to four frames in the system, if the MT and the MB are both in an open state, the upper surface spray MT1 between the frames and the lower surface spray MB1 between the frames are firstly closed, the temperature is monitored after an actual temperature sampling period by the infrared imaging thermometer after the shutdown, if the temperature is higher than 70 ℃, the temperature monitoring is continued according to a normal program, if the temperature is still lower than 70 ℃, the upper surface spray MT2 between the frames and the lower surface spray MB2 between the frames are closed, and the infrared imaging thermometer monitors the temperature after an actual temperature sampling period after the shutdown, by analogy, if the temperature is lower than 70 ℃, all cooling sprays behind one to four racks are finally closed, and if the temperature is still lower than 70 ℃, the system prompts alarm information to suggest operators to intervene;
(3) when the temperature of the plate surface is monitored to be higher than 100 ℃ by an infrared imaging thermometer at the outlet of the rolling mill, the process machine carries out state detection on the upper surface spray MT between the racks and the lower surface spray MB between the racks after one rack to four racks in the system and firstly opens the upper surface spray MT4 between the four racks and the five racks and the lower surface spray MB between the four racks and the five racks (MB4) if the MT and the MB are both in a closed state, the infrared imaging thermometer monitors the temperature after being opened in an actual temperature sampling period, if the temperature is lower than 100 ℃, the temperature monitoring is continuously carried out according to a normal program, if the temperature is still higher than 100 ℃, the upper surface spray MT3 between the three racks and the four racks and the lower surface spray MB3 between the three racks and the four racks are opened, the infrared imaging thermometer monitors the temperature after being opened in an actual temperature sampling period, and so on, if the temperature is higher than 100 ℃, all cooling sprays after four to one machine frame are finally started, and if the temperature is still higher than 100 ℃, the system prompts alarm information to suggest operators to intervene.
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| JP2000202509A (en) * | 1999-01-13 | 2000-07-25 | Nippon Steel Corp | Rolling method of cold tandem rolling mill |
| CN104070074A (en) * | 2013-03-25 | 2014-10-01 | 宝山钢铁股份有限公司 | A method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack |
| CN104209346A (en) * | 2014-09-09 | 2014-12-17 | 马鞍山马钢华阳设备诊断工程有限公司 | Online monitoring device and method for rolling mill lubricating oil without temperature compensation |
| CN105527132A (en) * | 2014-09-29 | 2016-04-27 | 上海宝钢工业技术服务有限公司 | Cold rolling mill oil mist sampling system and analysis method thereof |
| CN106377959A (en) * | 2016-10-14 | 2017-02-08 | 上海方久轧制油净化技术有限公司 | Controlling method for stopping oil mist recovering system |
| CN106678528A (en) * | 2017-03-21 | 2017-05-17 | 安徽永杰铜业有限公司 | Roller lubricating oil mist collecting and reutilizing device |
| CN207723199U (en) * | 2017-11-29 | 2018-08-14 | 中冶南方工程技术有限公司 | A kind of stainless steel cold continuous rolling lubricating and cooling system |
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2019
- 2019-02-13 CN CN201910112305.4A patent/CN109821898B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000202509A (en) * | 1999-01-13 | 2000-07-25 | Nippon Steel Corp | Rolling method of cold tandem rolling mill |
| CN104070074A (en) * | 2013-03-25 | 2014-10-01 | 宝山钢铁股份有限公司 | A method for controlling the temperature of steel plates of high-temperature rolling of a rolling mill with a single rack |
| CN104209346A (en) * | 2014-09-09 | 2014-12-17 | 马鞍山马钢华阳设备诊断工程有限公司 | Online monitoring device and method for rolling mill lubricating oil without temperature compensation |
| CN105527132A (en) * | 2014-09-29 | 2016-04-27 | 上海宝钢工业技术服务有限公司 | Cold rolling mill oil mist sampling system and analysis method thereof |
| CN106377959A (en) * | 2016-10-14 | 2017-02-08 | 上海方久轧制油净化技术有限公司 | Controlling method for stopping oil mist recovering system |
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