CN103727019A - Constant-current frequency conversion control system for brine pumps of freezing station - Google Patents
Constant-current frequency conversion control system for brine pumps of freezing station Download PDFInfo
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- CN103727019A CN103727019A CN201310724123.5A CN201310724123A CN103727019A CN 103727019 A CN103727019 A CN 103727019A CN 201310724123 A CN201310724123 A CN 201310724123A CN 103727019 A CN103727019 A CN 103727019A
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Abstract
The invention discloses a constant-current frequency conversion control system for brine pumps of a freezing station. The constant-current frequency conversion control system comprises a computer monitoring unit, frequency conversion control cabinets, brine pump units and detection units. The frequency conversion control cabinets control the brine pump units, the detection units transmit acquired brine flow rate signals to the frequency conversion control cabinets, and output frequencies of frequency converters are controlled by the aid of a PID (proportion, integration and differentiation) control method, so that the rotational speeds of brine motors can be changed, flow rates of brine in pipelines can reach set values, and a constant-current control effect can be realized. The constant-current frequency conversion control system has the advantages that the frequency conversion control cabinets control the brine pump units, the frequency conversion control cabinets and a computer are networked with one another on the basis of PROFIBUS-DP (process field bus-decentralized peripherals) data buses to monitor the brine pumps in a centralized manner, accordingly, the system can effectively carry out data comparison and cooperative control, and networking and centralized control effects can be realized.
Description
Technical field
The present invention relates to Freezing Station brine circulation system technical field, be specifically related to Freezing Station brine pump constant current frequency-changing control system.
Background technique
According to statistics, motor consumes 62% left and right of national power consumption every year, is first large electricity consumer, is also the user of energy-saving potential maximum.Wherein, the annual power consumption of general-purpose machine system of blower fan, pump, compressor and so on accounts for 31% of national generating capacity, and wherein variable load operation accounts for 70%.As can be seen here, fans&pumps motors speed governing potentiality are very large, and not high to speed governing required precision, and Energy-saving Perspective is very wide.
Current each frozen construction unit, when the design of frozen construction tissue and adjusting brine flow, has the following disadvantages:
(a) when carrying out Design of Construction Organization, power system capacity design leaves larger allowance, and during actual motion, system matches is unreasonable, and " low load with strong power " often, causes a large amount of energy wastes;
(b) only valve opening is regulated, water pump dragging motor is still in permanent rotation speed operation state, and a large amount of energy dissipations, in valve and pipeline, owing to suppressing the situation long-term existence of pump, cause the life-span of water pump greatly to shorten;
(c) regulate during brine recycling by pipeline pressure as a reference, and freezing pipe is equivalent to U-shaped pipe, and the import and export of salt solution are highly equal, the static lift of brine pump is zero, and the rotating speed of brine pump just changes the flow of salt solution, and it is irrelevant with lift, and salt solution has continuity in the pipeline of sealing, itself has certain kinetic energy and potential energy, even if the rotating speed of brine pump is very low, salt solution also can flow in pipeline, so adopt having little significance of constant pressure water supply here;
(d) when brine pump unit carries out independence control, cannot effectively carry out comparing and Collaborative Control, the function of Centralized Monitoring is carried out in unrealized and computer networking, and automaticity is low;
Therefore, realize the collection control techniques of Freezing Station brine pump VFC, to energy-saving and emission-reduction, reduction business electrical cost; Realize on-line monitoring, the remote monitoring of whole Freezing Station equipment, improve working stability and the troubleshooting capability of Freezing Station, reduce equipment loss, improve automation, the level of IT application, tool is of great significance.
Summary of the invention
The object of the invention is to overcome the shortcoming and defect of above-mentioned prior art, a kind of Freezing Station brine pump constant current frequency-changing control system is provided.This constant current frequency-changing control system can be realized the constant current control of salt solution, control and the remote monitoring of brine pump operating frequency, improve the precision of brine recycling control and the working efficiency of system, reduce equipment loss, save a large amount of energy and maintenance fund, improve the automatization level of system.
In order to achieve the above object, the invention provides a kind of Freezing Station brine pump constant current frequency-changing control system, comprise computer monitoring unit, frequency-conversion control cabinet unit, brine pump unit, and detecting signal unit, it is characterized in that: the control mechanism of whole system is frequency-conversion control cabinet, inside comprises PLC controller and frequency variator, in detecting signal unit, flow transducer and pressure transducer are connected on PLC controller, actuator's brine pump unit of system is connected with frequency variator, frequency-conversion control cabinet control brine pump unit is also connected communication with computer by data/address bus, realize computer remote monitoring function.
On described frequency conversion tank peripheral operation panel, there is instrument, tutorial light, Frequency Converter Control panel and touch screen.
Described detection unit comprises flow transducer and pressure transducer.
The brine flow size detecting in brine recycling pipeline by flow transducer compares with setting flow value, and in PLC controller, adopt PID controlling method to regulate analysis, then the output frequency of output signal control frequency variator changes the rotating speed of brine pump, realizes the object of constant current VFC.
Brine pump unit is no longer independent control, but based on the realization of PROFIBUS-DP data/address bus and computer networking and carry out Centralized Monitoring, can effectively carry out Data Comparison and Collaborative Control.Operator can understand and control the working order of all brine pump units without reaching the spot, and improve automaticity.
In conjunction with the working principle of structural feature of the present invention and institute's foundation, beneficial effect of the present invention is embodied as:
(a) remote monitoring, automation, the level of IT application have been improved, PLC in frequency-conversion control cabinet has increased communication module, there is stronger network communication ability, by being connected with upper-position unit (industrial control computer), realize the remote monitoring of systems connection and brine pump, make staff at night shift room, can see the working order of every water pump, Real Time Observation also records various Operational Limitss, and can apply control to brine pump, has improved automation, the level of IT application of whole Freezing Station.
(b) constant current control, improved control accuracy, compared with conventional constant pressure water supply control system, freezing pipe is equivalent to U-shaped pipe, the import and export of salt solution are highly equal, the static lift that is brine pump is zero, the rotating speed of brine pump just changes the flow of salt solution, and irrelevant with lift, and salt solution has continuity in the pipeline of sealing, itself has certain kinetic energy and potential energy, even if the rotating speed of brine pump is very low, salt solution also can flow in pipeline, so the present invention adopts constant current control, and more can be directly, the accurate mesohalobic flow of pilot line.
(c) the present invention no longer changes brine flow by changing valve opening, but utilize variable-frequency control technique to regulate the rotating speed of brine pump, valve is without frequent movement, eliminated and suppressed pump phenomenon, extended the working life of equipment, reduce the energy dissipation in valve and pipeline, improved the working efficiency of system.
(d) realize soft start, variable-frequency control technique can make motor realize soft start in on-load situation, effectively suppresses and avoided the impact of large Current on Grid and machinery.
Accompanying drawing explanation
Accompanying drawing 1 is Freezing Station brine pump constant current frequency-changing control system schematic diagram.
Wherein (1) is computer monitoring unit; (2) be frequency-conversion control cabinet, inside comprises frequency variator, and PLC controller etc., have various instrument, tutorial light, control knob, Frequency Converter Control panel and touch screen on peripheral operation panel; (3) be pressure transducer; (4) be flow transducer; (5) be brine pump unit; (6) other brine pump unit and frequency-conversion control cabinets.
Embodiment
Below with reference to the accompanying drawings the present invention's invention is elaborated.
In the present embodiment, by being arranged on the flow of salt solution in the flow transducer signal piping in saline line, and after being converted to electrical signal, flow inputs PLC controller, and in PLC controller, adopting PID controlling method to control, the output frequency of output signal control frequency variator changes the rotating speed of brine pump.When freezing chilling requirement increase, the flow of pipeline inside is less than setting flow, and after flux signal regulates by PID, frequency variator output frequency increases, and pump motor rotating speed improves, and brine stream quantitative change is large until stable; On the contrary, when freezing chilling requirement and reduce, the flow of pipeline inside is greater than setting flow, and after flux signal regulates by PID, frequency variator output frequency reduces, and pump motor rotating speed reduces, and brine flow diminishes until stablize.Pressure transducer in detection unit of the present invention only plays the effect of supervision, is not to utilize the pressure signal that detects for according to carrying out variable frequency adjustment control in closed loop control.
In addition to the implementation, the present invention can also have other mode of execution.All employings are equal to the technological scheme of replacement or equivalent version, all drop on the protection domain of requirement of the present invention.
Claims (3)
1. one kind is freezed salt solution constant current frequency-changing control system, comprise computer monitoring unit, frequency-conversion control cabinet unit, brine pump unit, and detecting signal unit, it is characterized in that: the control mechanism of whole system is frequency-conversion control cabinet, inside comprises PLC controller and frequency variator, in detecting signal unit, flow transducer and pressure transducer are connected on PLC controller, actuator's brine pump unit of system is connected with frequency variator, frequency-conversion control cabinet is take the piping flow signal of detection unit flow transducer collection as foundation, control brine pump unit operating frequency, realize the control of constant current frequency conversion, no longer independent operating of frequency-conversion control cabinet control brine pump unit, but based on PROFIBUS-DP data/address bus and construction of computer network, realize computer remote monitoring and centralized control.
2. salt solution constant current frequency-changing control system according to claim 1, is characterized in that: on described frequency conversion tank peripheral operation panel, have instrument, tutorial light, Frequency Converter Control panel and touch screen.
3. salt solution constant current frequency-changing control system according to claim 1, is characterized in that: described detection unit comprises flow transducer and pressure transducer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724123.5A CN103727019A (en) | 2013-12-23 | 2013-12-23 | Constant-current frequency conversion control system for brine pumps of freezing station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310724123.5A CN103727019A (en) | 2013-12-23 | 2013-12-23 | Constant-current frequency conversion control system for brine pumps of freezing station |
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| CN103727019A true CN103727019A (en) | 2014-04-16 |
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| CN201310724123.5A Pending CN103727019A (en) | 2013-12-23 | 2013-12-23 | Constant-current frequency conversion control system for brine pumps of freezing station |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454563A (en) * | 2014-10-21 | 2015-03-25 | 苏州合欣美电子科技有限公司 | Flow control method of water pump |
| CN106979148A (en) * | 2017-05-19 | 2017-07-25 | 中煤特殊凿井有限责任公司 | A kind of control method of step-less adjustment high powered water pump or fan operation |
| CN110701018A (en) * | 2019-09-18 | 2020-01-17 | 钟灵宪 | Digital integrated full-frequency-conversion multi-sensor intelligent water system |
| CN110863988A (en) * | 2019-10-31 | 2020-03-06 | 上海斯可络压缩机有限公司 | Automatic downloading system for electrical parameters of screw compressor |
| CN111810392A (en) * | 2020-07-21 | 2020-10-23 | 北京航天发射技术研究所 | Dual-motor oil source control system and control method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS546898A (en) * | 1977-06-20 | 1979-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | Formation of sodium hypochlorite using brine |
| JP2006312122A (en) * | 2005-05-06 | 2006-11-16 | Hitachi Plant Technologies Ltd | Control method for electrolysis of sludge |
| CN201972199U (en) * | 2011-01-28 | 2011-09-14 | 福建青松股份有限公司 | Automatic constant pressure device in water supply system |
| CN203223360U (en) * | 2013-03-13 | 2013-10-02 | 武汉理工大学 | Water pump energy-saving device of fan |
-
2013
- 2013-12-23 CN CN201310724123.5A patent/CN103727019A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS546898A (en) * | 1977-06-20 | 1979-01-19 | Ishikawajima Harima Heavy Ind Co Ltd | Formation of sodium hypochlorite using brine |
| JP2006312122A (en) * | 2005-05-06 | 2006-11-16 | Hitachi Plant Technologies Ltd | Control method for electrolysis of sludge |
| CN201972199U (en) * | 2011-01-28 | 2011-09-14 | 福建青松股份有限公司 | Automatic constant pressure device in water supply system |
| CN203223360U (en) * | 2013-03-13 | 2013-10-02 | 武汉理工大学 | Water pump energy-saving device of fan |
Non-Patent Citations (3)
| Title |
|---|
| 苏静明等: ""基于PLC和组态王的节能控制站远程监控***研究"", 《工矿自动化》 * |
| 苏静明等: "煤矿冻结凿井冻结站盐水流量智能控制***研究", 《煤炭工程》 * |
| 郭垒: ""基于PLC的变频节能***在井筒冻结施工中应用的研究"", 《工矿自动化》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104454563A (en) * | 2014-10-21 | 2015-03-25 | 苏州合欣美电子科技有限公司 | Flow control method of water pump |
| CN106979148A (en) * | 2017-05-19 | 2017-07-25 | 中煤特殊凿井有限责任公司 | A kind of control method of step-less adjustment high powered water pump or fan operation |
| CN110701018A (en) * | 2019-09-18 | 2020-01-17 | 钟灵宪 | Digital integrated full-frequency-conversion multi-sensor intelligent water system |
| CN110863988A (en) * | 2019-10-31 | 2020-03-06 | 上海斯可络压缩机有限公司 | Automatic downloading system for electrical parameters of screw compressor |
| CN111810392A (en) * | 2020-07-21 | 2020-10-23 | 北京航天发射技术研究所 | Dual-motor oil source control system and control method |
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Application publication date: 20140416 |