CN108057725B - Control method of descaling system - Google Patents
Control method of descaling system Download PDFInfo
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- CN108057725B CN108057725B CN201711478455.4A CN201711478455A CN108057725B CN 108057725 B CN108057725 B CN 108057725B CN 201711478455 A CN201711478455 A CN 201711478455A CN 108057725 B CN108057725 B CN 108057725B
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- descaling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B45/00—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills
- B21B45/04—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing
- B21B45/08—Devices for surface or other treatment of work, specially combined with or arranged in, or specially adapted for use in connection with, metal-rolling mills for de-scaling, e.g. by brushing hydraulically
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Abstract
The invention discloses a control method of a descaling system, and belongs to the technical field of steel smelting. By the control method of the descaling system, when the 30MPa variable-frequency descaling pump system is required to perform rough descaling and the 25MPa descaling pump system is required to perform system fine descaling, the electric valve is closed, and the descaling system can be divided into two sets of pressure systems to meet the use of a steel plate with high descaling requirement, so that the diversity of products and the high quality requirement of the surface of the products are ensured; when the 25MPa descaling pump system is only needed to perform fine descaling, the electric valve is opened, so that the 30MPa variable-frequency descaling pump system is communicated with the 25MPa descaling pump system, the 30MPa variable-frequency descaling pump provides 25MPa high-pressure descaling water through frequency conversion of a frequency converter, and the whole descaling system performs 25MPa pressure descaling to reduce energy consumption of field production.
Description
Technical Field
The invention relates to a control method of a descaling system, and belongs to the technical field of steel smelting.
Background
The high-pressure water descaling is to spray high-pressure water from a high-pressure pipeline system through a nozzle of a collecting pipe to strike on a high-temperature billet, rapidly cool the billet by the high-pressure water to generate temperature difference between the scale and the billet body, mechanically descale the cracked scale on the surface, and then shovel the scale on the surface of the billet by the striking force generated by the high-pressure water.
The high-pressure centrifugal descaling system is mainly used for plate strip production, and has the advantages of long rolling time, more descaling passes, more descaling points on a rolling line and large descaling water consumption.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the control method of the descaling system, which can be divided into two sets of pressure systems to meet the use requirement of a steel plate with high descaling requirement, so as to ensure the diversity of products and the high quality requirement of the surface of the products, can switch the mode sharing system mode to reduce the energy consumption of field production, and achieve the purpose of reducing the initial project investment and daily production cost.
The technical scheme for solving the technical problems is as follows: a control method of a descaling system comprises a 30MPa variable-frequency descaling pump system and a 25MPa descaling pump system which are connected through electric valves, and comprises the following steps:
filtering the descaling water by a self-cleaning filter for later use;
⑵ before the 30MPa variable frequency descaling pump system and the 25MPa descaling pump system are started, the injection valves and the minimum flow valves of the two systems are respectively closed, the outlet output valves of the 30MPa variable frequency descaling pump and the 25MPa descaling pump are opened, the lowest liquid level valve and the pneumatic gate valve in front of the lowest liquid level valve are opened, water is firstly added to the energy accumulators of the two systems, when the energy accumulators add water to a set liquid level, the water adding is stopped, the lowest liquid level valves of the two systems are closed, and the outlet output valve of the pump is closed;
⑶, manually starting the high-pressure air compressors of the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system respectively, and supplying air to the energy accumulators, so that the air supply of the high-pressure air compressors is stopped after the internal pressure of the energy accumulators of the two systems reaches the set pressure;
⑷ 30MPa variable-frequency descaling pump system and 25MPa descaling pump system, respectively fully exhausting gas, opening a minimum flow valve, respectively starting the 30MPa variable-frequency descaling pump and the 25MPa descaling pump, and enabling the whole system to enter an automatic operation state;
⑸ when the 30MPa variable-frequency descaling pump system is needed to perform rough descaling and the 25MPa descaling pump system is needed to perform system fine descaling, the electric valve is closed;
A. when the steel billet reaches the descaling box, the 30MPa variable-frequency descaling pump system automatically opens the injection valve, and the energy accumulator of the 30MPa variable-frequency descaling pump system supplies water to a descaling point; when the liquid level of an energy accumulator of the 30MPa variable-frequency descaling pump system is lowered to a set value, water is supplied to the energy accumulator of the 30MPa variable-frequency descaling pump system and the energy accumulator of the 30MPa variable-frequency descaling pump system for descaling at the same time, an injection valve is automatically closed after descaling, the 30MPa variable-frequency descaling pump supplies water to the energy accumulator, the 30MPa variable-frequency descaling pump operates at a reduced speed after the pressure set value of the energy accumulator of the 30MPa variable-frequency descaling pump system is reached, and at the moment, the 30MPa variable-frequency descaling pump does not output flow;
B. when the steel billet reaches the rolling mill, the 25MPa descaling pump system prevents the pipeline from vibrating, a pre-filling water valve of the 25MPa descaling pump system is opened and delays for a certain time, the pre-filling water valve is closed, the 25MPa descaling pump system is opened, and an energy accumulator of the 25MPa descaling pump system supplies water for the rolling mill to descale;
⑹ when only 25MPa descaling pump system is needed for fine descaling;
an electric valve between the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system is opened, so that the 30MPa variable-frequency descaling pump system is communicated with the 25MPa descaling pump system, the 30MPa variable-frequency descaling pump provides 25MPa high-pressure descaling water through frequency conversion of a frequency converter, and the whole descaling system performs 25MPa pressure descaling.
The improvement of the technical scheme is as follows: if the liquid level of the energy accumulator in the descaling system reaches the lowest set value, the high-pressure liquid level meter transmits a signal to the control system, the control system automatically closes the lowest liquid level valve to prevent high-pressure gas from flowing into the pipeline, and the lowest liquid level valve has the function of a one-way valve, namely, high-pressure water only can enter the energy accumulator; when the water level of an energy accumulator in the descaling system is recovered to a normal state, the lowest liquid level valve is recovered to the normal state; and if the liquid level of the energy accumulator reaches the highest set value and the pressure value reaches the lower limit of the specified range, the control system gives an alarm, and the air compressor is manually started to supplement air to the energy accumulator.
The invention has the beneficial effects that:
the descaling pump station in the control method of the descaling system is divided into two sets of systems of 30MPa and 25MPa, the two sets of systems can be operated independently or can share the 25MPa system after being communicated through a valve, and the two sets of systems can be divided into two sets of pressure systems to meet the use of a steel plate with high descaling requirement, so that the diversity of products and the high quality requirement of the surface of the products can be ensured; and the mode can be switched to share the system mode to reduce the energy consumption of field production, thereby achieving the purpose of reducing the cost and saving the annual total price of the electric charge by about 205 ten thousand yuan.
Detailed Description
Example 1
The descaling system of the embodiment comprises a 30MPa variable-frequency descaling pump system and a 25MPa descaling pump system which are connected through electric valves, and the control method of the descaling system comprises the following steps:
⑴ filtering the water for descaling by a self-cleaning filter for later use;
⑵ before the 30MPa variable frequency descaling pump system and the 25MPa descaling pump system are started, the injection valves and the minimum flow valves of the two systems are respectively closed, the outlet output valves of the 30MPa variable frequency descaling pump and the 25MPa descaling pump are opened, the lowest liquid level valve and the pneumatic gate valve in front of the lowest liquid level valve are opened, water is firstly added to the energy accumulators of the two systems, when the energy accumulators add water to a set liquid level, the water adding is stopped, the lowest liquid level valves of the two systems are closed, and the outlet output valve of the pump is closed;
⑶, manually starting the high-pressure air compressors of the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system respectively, and supplying air to the energy accumulators, so that the air supply of the high-pressure air compressors is stopped after the internal pressure of the energy accumulators of the two systems reaches the set pressure;
⑷ 30MPa variable-frequency descaling pump system and 25MPa descaling pump system, respectively fully exhausting gas, opening a minimum flow valve, respectively starting the 30MPa variable-frequency descaling pump and the 25MPa descaling pump, and enabling the whole system to enter an automatic operation state;
⑸ when the 30MPa variable-frequency descaling pump system is needed to perform rough descaling and the 25MPa descaling pump system is needed to perform system fine descaling, the electric valve is closed;
A. when the steel billet reaches the descaling box, the 30MPa variable-frequency descaling pump system automatically opens the injection valve, and the energy accumulator of the 30MPa variable-frequency descaling pump system supplies water to a descaling point; when the liquid level of an energy accumulator of the 30MPa variable-frequency descaling pump system is lowered to a set value, water is supplied to the energy accumulator of the 30MPa variable-frequency descaling pump system and the energy accumulator of the 30MPa variable-frequency descaling pump system for descaling at the same time, an injection valve is automatically closed after descaling, the 30MPa variable-frequency descaling pump supplies water to the energy accumulator, the 30MPa variable-frequency descaling pump operates at a reduced speed after the pressure set value of the energy accumulator of the 30MPa variable-frequency descaling pump system is reached, and at the moment, the 30MPa variable-frequency descaling pump does not output flow;
B. when the steel billet reaches the rolling mill, the 25MPa descaling pump system prevents the pipeline from vibrating, a pre-filling water valve of the 25MPa descaling pump system is opened and delays for a certain time, the pre-filling water valve is closed, the 25MPa descaling pump system is opened, and an energy accumulator of the 25MPa descaling pump system supplies water for the rolling mill to descale;
⑹ when only 25MPa descaling pump system is needed for fine descaling;
an electric valve between the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system is opened, so that the 30MPa variable-frequency descaling pump system is communicated with the 25MPa descaling pump system, the 30MPa variable-frequency descaling pump provides 25MPa high-pressure descaling water through frequency conversion of a frequency converter, and the whole descaling system performs 25MPa pressure descaling.
If the liquid level of an energy accumulator in the descaling system reaches a lowest set value, a high-pressure liquid level meter transmits a signal to a control system, the control system automatically closes a lowest liquid level valve to prevent high-pressure gas from entering a pipeline, and the lowest liquid level valve has the function of a one-way valve, namely, high-pressure water only can enter the energy accumulator; when the water level of an energy accumulator in the descaling system is recovered to a normal state, the lowest liquid level valve is recovered to the normal state; and if the liquid level of the energy accumulator reaches the highest set value and the pressure value reaches the lower limit of the specified range, the control system gives an alarm, and the air compressor is manually started to supplement air to the energy accumulator.
The descaling system of the embodiment has two kinds of descaling pressure selection, the first mode is that two systems of 25MPa and 30MPa coexist, an intermediate pipeline is separated by an electric valve, 25MPa is used for descaling of a rolling mill, and 30MPa is used for rough descaling, so that the use of a steel plate with high descaling requirement can be met; the second mode is that an electric valve between 25MPa and 30MPa systems is opened, a 30MPa variable-frequency descaling pump system reduces the frequency and the speed, the two systems are combined into a whole, the same pressure grade (25 MPa pressure is used), and the mode can save energy.
The predicted annual economic benefit can reach 205 ten thousand yuan: 1. the electricity cost is saved by 3 degrees/ton, calculated according to 0.57 yuan per degree of electricity and 120 ten thousand tons per year of output, and the annual total saved cost is 205 ten thousand yuan.
In addition to the above embodiments, the present invention may have other embodiments. All technical solutions formed by adopting equivalent substitutions or equivalent transformations fall within the protection scope of the claims of the present invention.
Claims (2)
1. A control method of a descaling system is characterized in that: the descaling system comprises a 30MPa variable-frequency descaling pump system and a 25MPa descaling pump system which are connected through electric valves, and the control method of the descaling system comprises the following steps:
⑴ filtering the water for descaling by a self-cleaning filter for later use;
⑵ before the 30MPa variable frequency descaling pump system and the 25MPa descaling pump system are started, the injection valves and the minimum flow valves of the two systems are respectively closed, the outlet output valves of the 30MPa variable frequency descaling pump and the 25MPa descaling pump are opened, the lowest liquid level valve and the pneumatic gate valve in front of the lowest liquid level valve are opened, water is firstly added to the energy accumulators of the two systems, when the energy accumulators add water to a set liquid level, the water adding is stopped, the lowest liquid level valves of the two systems are closed, and the outlet output valve of the pump is closed;
⑶, manually starting the high-pressure air compressors of the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system respectively, and supplying air to the energy accumulators, so that the air supply of the high-pressure air compressors is stopped after the internal pressure of the energy accumulators of the two systems reaches the set pressure;
⑷ 30MPa variable-frequency descaling pump system and 25MPa descaling pump system, respectively fully exhausting gas, opening a minimum flow valve, respectively starting the 30MPa variable-frequency descaling pump and the 25MPa descaling pump, and enabling the whole system to enter an automatic operation state;
⑸ when the 30MPa variable-frequency descaling pump system is needed to be used for rough descaling and the 25MPa descaling pump system is needed to be used for fine descaling, the electric valve is closed;
A. when the steel billet reaches the descaling box, the 30MPa variable-frequency descaling pump system automatically opens the injection valve, and the energy accumulator of the 30MPa variable-frequency descaling pump system supplies water to a descaling point; when the liquid level of an energy accumulator of the 30MPa variable-frequency descaling pump system is lowered to a set value, water is supplied to the energy accumulator of the 30MPa variable-frequency descaling pump system and the energy accumulator of the 30MPa variable-frequency descaling pump system for descaling at the same time, an injection valve is automatically closed after descaling, the 30MPa variable-frequency descaling pump supplies water to the energy accumulator, the 30MPa variable-frequency descaling pump operates at a reduced speed after the pressure set value of the energy accumulator of the 30MPa variable-frequency descaling pump system is reached, and at the moment, the 30MPa variable-frequency descaling pump does not output flow;
B. when the steel billet reaches the rolling mill, the 25MPa descaling pump system prevents the pipeline from vibrating, a pre-filling water valve of the 25MPa descaling pump system is opened and delays for a certain time, the pre-filling water valve is closed, the 25MPa descaling pump system is opened, and an energy accumulator of the 25MPa descaling pump system supplies water for the rolling mill to descale;
⑹ when only 25MPa descaling pump system is needed for fine descaling;
an electric valve between the 30MPa variable-frequency descaling pump system and the 25MPa descaling pump system is opened, so that the 30MPa variable-frequency descaling pump system is communicated with the 25MPa descaling pump system, the 30MPa variable-frequency descaling pump provides 25MPa high-pressure descaling water through frequency conversion of a frequency converter, and the whole descaling system performs 25MPa pressure descaling.
2. The control method of a descaling system according to claim 1, wherein: when the descaling system is used, if the liquid level of the energy accumulator in the descaling system reaches the lowest set value, the high-pressure liquid level meter transmits a signal to the control system, the control system automatically closes the lowest liquid level valve to prevent high-pressure gas from flowing into a pipeline, and the lowest liquid level valve has the function of a one-way valve, namely, high-pressure water only can enter the energy accumulator; when the water level of an energy accumulator in the descaling system is recovered to a normal state, the lowest liquid level valve is recovered to the normal state; and if the liquid level of the energy accumulator reaches the highest set value and the pressure value reaches the lower limit of the specified range, the control system gives an alarm, and the air compressor is manually started to supplement air to the energy accumulator.
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| CN201711478455.4A CN108057725B (en) | 2017-12-29 | 2017-12-29 | Control method of descaling system |
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| EP0625383B1 (en) * | 1993-05-17 | 1998-02-25 | DANIELI & C. OFFICINE MECCANICHE S.p.A. | Line to produce strip and/or sheet |
| JPH09271832A (en) * | 1996-04-08 | 1997-10-21 | Nippon Steel Corp | Descaling method of hot rolled ferritic stainless steel plate |
| CN100411763C (en) * | 2005-12-09 | 2008-08-20 | 广东韶钢松山股份有限公司 | High-pressure water descaling system |
| CN101559439A (en) * | 2009-05-26 | 2009-10-21 | 广州金关节能科技发展有限公司 | Energy-saving control method for multi-section descaling and control device thereof |
| CN103302117B (en) * | 2013-06-21 | 2015-09-09 | 上海宝钢节能环保技术有限公司 | A kind of frequency-changing control system of single pump de-scaling and control method thereof |
| CN103909103A (en) * | 2014-02-12 | 2014-07-09 | 上海宝菱电气控制设备有限公司 | Slab descaling pump system and method |
| CN105834232A (en) * | 2015-01-15 | 2016-08-10 | 宝钢不锈钢有限公司 | High-pressure water descaling intelligent energy-saving system and control method thereof |
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Effective date of registration: 20201230 Address after: 223801 Suyu Economic Development Zone, Suqian City, Jiangsu Province Patentee after: SUQIAN JINXIN STEEL ROLLING Co.,Ltd. OF NISCO Address before: Liuhe District of Nanjing City, Jiangsu province 210035 xiejiadian Patentee before: Nanjing Iron&Steel Co.,Ltd. |